[Feature Request]: Remove Kotlin Android extensions

[BenHenning]

Is your feature request related to a problem? Please describe.

We use some synthetics generated by the Kotlin Android extensions plugin. Per https://developer.android.com/topic/libraries/view-binding/migration it's deprecated.

Describe the solution you'd like

https://developer.android.com/topic/libraries/view-binding/migration has alternative migration pathways, where appropriate. In most cases, we just need to use the direct view based on ID or via the local binding rather than synthetics.

Describe alternatives you've considered

None since this is a deprecation.

Additional context

This might be causing some incremental build incompatibilities between the old version of Gradle we're using and Jetpack Compose (being introduced as part of #5344).

[BenHenning]

FWIW I think we removed all synthetic imports back when Bazel was initially introduced, so we may not actually have any code changes needed here beyond removing the plugin.