chore(ci): update workflows

[raducristianpopa]

Closes #22.

This PR updates the current workflow files and adds a couple of new ones:

• sanity - will be triggered whenever we push on the main branch

  • currently only builds the extension for all browsers
  • will need to add linting and testing as well to make sure that everything works accordingly after a merge

• pr-checks - will be triggered whenever a new PR is created

  • builds the extension for all browser and uploads all the ZIP files as artifacts
  • needs linting + testing as well
  • concurrency (when pushing a new commit, previous running actions will be cancelled)

• build-previews - will be triggered when the pr-checks workflow is finished (on success or failure - the status does not matter)

  • retrieves the latest PR artifacts and adds a comment with a table (or it updates the existing one) with:
    • latest commit SHA
    • latest job logs URL
    • all ZIP files download URL (for all browsers) which contains the build status and the ZIP size
    • it will not add/update the comment with the builds preview if the pr-checks action gets cancelled

• delete-pr-artifacts - will be triggered when a PR is closed

  • deletes all uploaded artifacts for this specific PR (all builds preview)

Concerns

The build-previews workflow might not be triggered when a PR is made from a fork (still needs a bit of research). The primary goal was to ensure that the previews are available for us when we create a PR, allowing us to test all the changes.

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The comment with all the links will be added when the workflow will be in the main branch, that's why for this PR the build previews are not available.

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