bootstrap: Render doctest timing reports as text, not JSON

[Zalathar]

These doctest timing reports were added to libtest/rustdoc in #144909, but bootstrap's custom test-output renderer wasn't taught about them, so they were being printed as raw JSON instead.

Before:

{ "type": "report", "total_time": 0.738403958, "compilation_time": 0.731513292 }

After:

all doctests ran in 0.73s; merged doctests compilation took 0.72s

Detailed before/after in context

Before

$ x test rustc_mir_transform --doc
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.03s
Testing stage1 {rustc_mir_transform} (aarch64-apple-darwin)
    Finished `release` profile [optimized + debuginfo] target(s) in 0.12s
   Doc-tests rustc_mir_transform

running 19 tests
iiiiiiiiiiii.......

test result: ok. 7 passed; 0 failed; 12 ignored; 0 measured; 0 filtered out; finished in 3.28ms


running 7 tests
iiiiiii

test result: ok. 0 passed; 0 failed; 7 ignored; 0 measured; 0 filtered out; finished in 403.67µs

{ "type": "report", "total_time": 0.738403958, "compilation_time": 0.731513292 }
	finished in 1.505 seconds
Build completed successfully in 0:00:01

After

$ x test rustc_mir_transform --doc
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.03s
Testing stage1 {rustc_mir_transform} (aarch64-apple-darwin)
    Finished `release` profile [optimized + debuginfo] target(s) in 0.12s
   Doc-tests rustc_mir_transform

running 19 tests
iiiiiiiiiiii.......

test result: ok. 7 passed; 0 failed; 12 ignored; 0 measured; 0 filtered out; finished in 3.12ms


running 7 tests
iiiiiii

test result: ok. 0 passed; 0 failed; 7 ignored; 0 measured; 0 filtered out; finished in 395.67µs

all doctests ran in 0.73s; merged doctests compilation took 0.72s
	finished in 1.493 seconds
Build completed successfully in 0:00:01

[rustbot]

r? @Kobzol

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[jieyouxu]

Thanks

View changes since this review

[jieyouxu]

I kinda wish there was a way for us to sync them, but then that'd run into staging problems 🤷 But anyway, fixing it to match is at least the sensible option.

Thanks
r? me @bors r+ rollup

[bors]

📌 Commit 610391f has been approved by jieyouxu

It is now in the queue for this repository.