[Flag Removal][Remove various credman flags]

This removes the flag that covered the session id bundle passing to the UI codebase,
as well as flags used in metric bugfixes, biometrics workflows, and adding credman instant app support in the past.
This also removes the new settings ui launch flag, as well as the selector ui improvements flag.
Moving forward, this should always be the default use case. All test cases, codebase references, and
aconfig flag values were removed for these flags.

Bug: 409605772
Bug: 409609994
Bug: 409611461
Bug: 409605885
Bug: 409605016
Bug: 409604680
Test: Build test/flag removal
Flag: EXEMPT removing framework_session_id_metric_bundle, credman_biometric_api_enabled, fix_metric_duplication_emits, instant_apps_enabled, new_settings_ui_launch, selector_ui_improvements_enabled
Change-Id: I63d85db0b40bcde89cf619c3328ca5822bedf7ba