Use --revert-annotation instead of --hide-annotation

Use of `--hide-annotation android.annotation.FlaggedApi` was always an
intermediate solution until the required semantics for `@FlaggedApi`
was determined. The `--revert-annotation` option provides those
semantics. When the `@FlaggedApi` is applied to an existing API, e.g.
because it has moved from system to public, or because it has changed
in some way, e.g. modifiers, then the correct semantics for when that
API is not required is not to hide the API but to revert it to what it
was before the change necessitating the `@FlaggedApi` annotation was
made.

Use --revert-annotation instead of --hide-annotation

Use of `--hide-annotation android.annotation.FlaggedApi` was always an
intermediate solution until the required semantics for `@FlaggedApi`
was determined. The `--revert-annotation` option provides those
semantics. When the `@FlaggedApi` is applied to an existing API, e.g.
because it has moved from system to public, or because it has changed
in some way, e.g. modifiers, then the correct semantics for when that
API is not required is not to hide the API but to revert it to what it
was before the change necessitating the `@FlaggedApi` annotation was
made.
Use --revert-annotation instead of --hide-annotation

Use of `--hide-annotation android.annotation.FlaggedApi` was always an
intermediate solution until the required semantics for `@FlaggedApi`
was determined. The `--revert-annotation` option provides those
semantics. When the `@FlaggedApi` is applied to an existing API, e.g.
because it has moved from system to public, or because it has changed
in some way, e.g. modifiers, then the correct semantics for when that
API is not required is not to hide the API but to revert it to what it
was before the change necessitating the `@FlaggedApi` annotation was
made.

Bug: 314196587
Test: ./gradlew
Change-Id: Ic97f29dd2b9f598ba0851f5f622c2a2724f18037