DEVOPS: Update Workflows

[ZanderCowboy]

• Update workflows to use correct semantic versioning

• Linting workflow still runs on every PR
• Move test coverage and CodeCov to linting.
• Develop workflow runs after a PR pointing to develop is merged.
  • A PR having either the label feature or bug is allowed to bump versioning, respectively, including build number.
  • Using feature: Bump minor
  • Using bug: Bump patch
  • A PR having any other labels should just get a build number bump
• Staging workflow
  • Should be run when a PR with a base branch that includes rc is pointed to main. Branches pattern - "rc", "rc/N" (where N is a number), "rc-N" or "rc_N". etc.
  • We should create a new build on every push and send to internal track
  • The underlying change: Create a RC branch off of develop once a release is imminent. Create a PR pointing to main, create a new build, send to Google Play. On every push, bump build number with new build and send to track.
  • Still the usual with the "-RC" part
• Production workflow
  • Needs to be manually dispatched
  • Looks at latest RC tag, remove rc, create new "production" tag and create release
  • Remove: No new builds should happen; we only look at the version that was merged into main and update the pubspec file.
  • For example, if we merged a RC PR into main, say the version in pubspec was 1.3.7-RC+155, then update the version to 1.3.7+155.

Refactoring:

• Reduce code duplications by creating actions
• Remove old workflows no longer being used.