ci: Optimised CI workflows

[afonsojramos]

After some investigation on Serenity's and Deno's GitHub Actions, I've taken myself to improve our own Workflows to:

• Add Clippy feedback within the PR's file changes using clippy-check.
  
• Separate Formatting and Linting into a separate workflow to take advantage of actions parallelism and reduce action time delta.
• Remove the unnecessary --release profile from normal day-to-day workflows, restricting it to builds in main and releases.
• Add build caching so that the action does not build from scratch on every step of the job.

In the end, this resulted in cutting build times by 50%, which will result in an increased development speed.