Bugzilla

As part of bug 1897976, I've updated all existing tests that are failing once the sidebar.revamp pref has been flipped on in the following ways:
* Created a secondary manifest file titled `browserSidebarRevamp.toml` with the `sidebar.revamp` pref set to `true`
* Created copies of test files affected by the pref flip and named them `browser_sidebarRevamp_[rest_of_test_name].js`
* Updated the test copies to account for the pref being flipped on

Once the pref has been flipped on by default, we should do some cleanup by removing the old tests, renaming the copied tests to remove the `sidebarRevamp` bit, consolidate the manifest file back into the original `browser.toml` and remove the pref from the top of that manifest file.

As part of bug 1897976, I've updated all existing tests that are failing once the sidebar.revamp pref has been flipped on in the following ways:
* Created a secondary manifest file titled `browserSidebarRevamp.toml` with the `sidebar.revamp` pref set to `true`
* Updated test files affected by the pref flip to add conditionals for when the pref is set to `true`

Once the pref has been flipped on by default, we should do some cleanup by removing conditionals in these tests and consolidate the manifest file back into the original `browser.toml` and remove the pref from the top of that manifest file.