Move github actions to this repo and make the easily composable

[ruocco-l]

As of now most teams are using workflow and scripts from this repo https://github.com/apify-store/github-actions-source.

We want to move the action in this library and make them as composable as possible.
Related to moving the actions:

• Forcing latest version of the library to be opt-in
• Remove deprecated inputs
• Optional unit tests/lint stage (To be discussed)
• Delegate the caller to pass the correct path to the platform test subfolder

[metalwarrior665]

First draft by Claude, convo here

TL;DR is

• reusable workflows would use a dynamic tag (e.g. v1) that we would move to each subsequent commit
• we would do this move only after npm publish from apify-test-tools package happens (if there is one)
• apify-test-tools doesn't depend on workflows so unless we do a breaking change (which we should not), we can freely update it. But workflow updates depend on apify-test-tools so it must move after it (ideally right after if we want to force latest version)
• This will only apply to v1. If we would go v2, we would manually update the sync

TODOs:

• Figure out naming of the workflows. It is not possible to add them to nested folder so the reusable ones will live together with out internals
• Think of edge cases. E.g. if we force using latest apify-test-tools, there might be short race condition between the version npm release and the re-tagging