Remove report callback

[camillobruni]

We have asyncyfied almost the complete runner by now and no longer need the report callback.
This makes it a bit easer to follow the code path.

Drive-by-fix:

• Remove needless constructor
• Add more tests to cover the schedulers

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[camillobruni]

BEFORE

browser                                     Google Chrome          Firefox                Safari
version                                     150.0.7871.125         152.0.5                26.5.2.0.21624.2.5.11.8
os                                          macos 26.5.2 arm64     macos 26.5.2 arm64     macos 26.5.2 arm64
model                                       MacBookPro18,2         MacBookPro18,2         MacBookPro18,2
cpu                                         Apple M1 Max 10 cores  Apple M1 Max 10 cores  Apple M1 Max 10 cores
runs                                        3                      3                      3
TodoMVC-JavaScript-ES5                      4.57 ± 2.7%            4.94 ± 5.1%            4.276 ± 0.46%
TodoMVC-JavaScript-ES6-Webpack-Complex-DOM  5.989 ± 1.3%           6.16 ± 2.5%            5.423 ± 0.44%
TodoMVC-WebComponents                       2.248 ± 1.6%           2.82 ± 10%             2.736 ± 1.8%
TodoMVC-React-Complex-DOM                   5.45 ± 2.1%            6.38 ± 3.5%            6.15 ± 5.9%
TodoMVC-React-Redux                         5.368 ± 1.6%           6.41 ± 1.9%            5.541 ± 1.5%
TodoMVC-Backbone                            3.753 ± 1.6%           4.67 ± 3.9%            4.83 ± 4.1%
TodoMVC-Angular-Complex-DOM                 3.868 ± 0.41%          6.40 ± 3.0%            5.030 ± 1.3%
TodoMVC-Vue                                 3.182 ± 2.2%           5.07 ± 2.4%            4.0500 ± 0.13%
TodoMVC-jQuery                              20.44 ± 2.4%           26.55 ± 1.9%           19.63 ± 0.98%
TodoMVC-Preact-Complex-DOM                  1.346 ± 3.7%           2.097 ± 2.1%           1.875 ± 1.8%
TodoMVC-Svelte-Complex-DOM                  1.2625 ± 0.69%         2.092 ± 2.0%           1.848 ± 3.5%
TodoMVC-Lit-Complex-DOM                     1.8630 ± 0.53%         3.06 ± 4.6%            2.215 ± 0.99%
NewsSite-Next                               16.390 ± 0.44%         20.21 ± 0.71%          16.98 ± 1.3%
NewsSite-Nuxt                               15.90 ± 1.1%           20.98 ± 3.7%           26.31 ± 2.3%
Editor-CodeMirror                           9.000 ± 0.69%          8.841 ± 0.82%          10.102 ± 0.90%
Editor-TipTap                               22.40 ± 0.59%          25.27 ± 0.72%          19.50 ± 0.62%
Charts-observable-plot                      6.215 ± 0.66%          8.80 ± 2.4%            7.03 ± 1.9%
Charts-chartjs                              8.700 ± 0.97%          9.10 ± 1.3%            7.919 ± 0.57%
React-Stockcharts-SVG                       26.11 ± 3.7%           41.07 ± 0.49%          28.14 ± 1.1%
Perf-Dashboard                              9.31 ± 2.2%            10.56 ± 1.7%           11.454 ± 0.53%
Score                                       167.67 ± 0.38%         129.5 ± 2.2%           147.59 ± 0.47%

AFTER

browser                                     Google Chrome          Firefox                Safari
version                                     150.0.7871.125         152.0.5                26.5.2.0.21624.2.5.11.8
os                                          macos 26.5.2 arm64     macos 26.5.2 arm64     macos 26.5.2 arm64
model                                       MacBookPro18,2         MacBookPro18,2         MacBookPro18,2
cpu                                         Apple M1 Max 10 cores  Apple M1 Max 10 cores  Apple M1 Max 10 cores
runs                                        3                      3                      3
TodoMVC-JavaScript-ES5                      4.572 ± 2.1%           4.861 ± 1.1%           4.35 ± 3.0%
TodoMVC-JavaScript-ES6-Webpack-Complex-DOM  5.90 ± 1.8%            6.27 ± 1.8%            5.392 ± 0.81%
TodoMVC-WebComponents                       2.213 ± 2.0%           2.98 ± 4.7%            2.589 ± 1.3%
TodoMVC-React-Complex-DOM                   5.42 ± 2.4%            6.432 ± 1.0%           6.10 ± 2.0%
TodoMVC-React-Redux                         5.377 ± 0.78%          6.53 ± 3.3%            5.605 ± 1.1%
TodoMVC-Backbone                            3.856 ± 1.7%           4.73 ± 3.9%            4.75 ± 2.4%
TodoMVC-Angular-Complex-DOM                 3.929 ± 2.1%           6.43 ± 2.0%            5.13 ± 2.7%
TodoMVC-Vue                                 3.272 ± 1.3%           5.04 ± 2.2%            4.07 ± 2.8%
TodoMVC-jQuery                              19.56 ± 2.5%           26.60 ± 3.2%           19.747 ± 0.44%
TodoMVC-Preact-Complex-DOM                  1.340 ± 2.2%           2.015 ± 3.0%           1.779 ± 1.5%
TodoMVC-Svelte-Complex-DOM                  1.284 ± 1.3%           2.090 ± 2.2%           1.801 ± 1.0%
TodoMVC-Lit-Complex-DOM                     1.906 ± 5.2%           2.97 ± 4.9%            2.203 ± 1.8%
NewsSite-Next                               16.20 ± 1.9%           20.08 ± 1.0%           17.26 ± 0.70%
NewsSite-Nuxt                               15.74 ± 1.1%           21.84 ± 2.9%           24.93 ± 3.0%
Editor-CodeMirror                           9.09 ± 2.7%            8.79 ± 1.6%            10.262 ± 0.62%
Editor-TipTap                               22.19 ± 1.7%           26.05 ± 1.3%           19.75 ± 0.61%
Charts-observable-plot                      6.152 ± 1.3%           8.742 ± 0.90%          7.065 ± 1.1%
Charts-chartjs                              8.631 ± 1.1%           9.26 ± 2.4%            8.13 ± 2.4%
React-Stockcharts-SVG                       25.27 ± 3.4%           38.7 ± 3.0%            28.31 ± 1.1%
Perf-Dashboard                              9.26 ± 2.4%            10.80 ± 4.0%           11.64 ± 2.6%
Score                                       168.2 ± 1.1%           129.2 ± 1.1%           147.74 ± 0.25%