Revert "Activity Log: Port AL into wp-admin as a native page"

[CGastrell]

Reverts #48244 just in case

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack or WordPress.com Site Helper), and enable the revert-48244-try-jetpack-activity-log-page branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack revert-48244-try-jetpack-activity-log-page

bin/jetpack-downloader test jetpack-mu-wpcom-plugin revert-48244-try-jetpack-activity-log-page

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• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 2 files.

File	Coverage	Δ%	Δ Uncovered
projects/packages/my-jetpack/src/class-initializer.php	54/313 (17.25%)	0.27%	0 💚
projects/plugins/jetpack/class.jetpack.php	748/2274 (32.89%)	0.01%	-1 💚

1 file is newly checked for coverage.

File	Coverage
projects/packages/my-jetpack/src/class-activitylog.php	3/17 (17.65%) 💔

Full summary · PHP report · JS report

_{If appropriate, add one of these labels to override the failing coverage check: Covered by non-unit tests Use to ignore the Code coverage requirement check when E2Es or other non-unit tests cover the code Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage.}