Remove dependencies on --experimental_google_legacy_api and --experimental_enable_android_migration_apis

[ahumesky]

[ahumesky]

Work has begun on migrating the remaining native providers to Starlark, which is the bulk of the work to remove the need for these flags

[ahumesky]

See #256 for provider starlark migration

[ahumesky]

These are no longer necessary with rules_android 0.6.0 (upcoming) (or at head) with Bazel 7.4.0+ / Bazel 8+.

They would still be necessary with Bazel 6, which is a problem for example for rules_jvm_external, but the solution there might be to continue to use the native rules.