feat(remove-android): Odds and ends

[DaveTryon]

Details

This cleans up some odds and ends from removing Android:

• Remove C# file types from various exclusion lists (I intentionally left the .vs folder, since it was in the .gitignore file before it was added to .prettierignore
• Remove some scraps of the old unified building scripts (calls were already removed, but not the guts)
• Remove configs to debug unified app from inside vscode
• Remove dependabot policy for electron

Motivation

Android deprecation feature (this is potentially the last PR for this step)

Context

There's a weird reference to playwright from inside main code. It feels like a bug, but since it's not part of the deprecation, I'll put it into a separate PR

Pull request checklist

• Addresses an existing issue: Android deprecation feature
• Ran yarn fastpass
• Added/updated relevant unit test(s) (and ran yarn test)
• Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• PR title AND final merge commit title both start with a semantic tag (fix:, chore:, feat(feature-name):, refactor:). See CONTRIBUTING.md.
• [n/a] (UI changes only) Added screenshots/GIFs to description above
• [n/a] (UI changes only) Verified usability with NVDA/JAWS