b/371020223

linux_android_emu and linux_android_emu_34 ran 2 different sets of dependencies because the adoption of 35 was unstable. The reasons why wound up being incompatible/bad versions of the build tool dependencies like the graphics engine chosen was unstable on 35. This was fixed with dependency changes.

Introduce an unstable linux android emulator configuration that can be used to prove a dependency set as stable.

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
• I signed the [CLA].
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with///).
• I added new tests to check the change I am making, or this PR is [test-exempt].
• I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
• All existing and new tests are passing.