Revert Aphrodite changes that were breaking bookmark modals

[bsclifton]

Fixes #12498
Unfixes #10977

Auditors: @NejcZdovc, @cezaraugusto

Revert "Polish CommonForm"
This reverts commit c5186d5.

Revert "Add FlyoutDialog"
This reverts commit 32dca6f.

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

N/A - this removes the feature

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[bsclifton]

Changes originally introduced with #10978 (has not been released yet)

[cezaraugusto]

++

[cezaraugusto]

master (0.24.x) 027fbd7
0.23.x ef75387