* Bug 1635488 - part 2: Add missing branch in version bump payload

* Bump version.txt to 84.0.0-beta.2

Items should follow the following ordering:
- current session open tabs
- collections options - currently the "Select tabs" button
- synced tabs items

This order should also be kept after returning from Multiselect mode.

Replace @string/tab_tray_menu_item_save with @string/tab_tray_menu_select, Remove "Share all tabs" option from tab tray's private browsing menu

Co-authored-by: Johan Lorenzo <jlorenzo@mozilla.com>

Instead of simply fixing the memory leak for this issue by directly
removing references, it makes more sense to move the whole
BiometricPrompt out of the fragment and into it's own feature to be
re-usable.

While StrictMode is not exclusively used for performance purposes, it's
primarily used for perf purposes so let's move it to the perf package
and code owner it.