Add cache-prefixing

[echang49]

Description:
This changes allow the state saved to the global action cache to be stored with a prefix. Useful as _state is not a unique name and multiple workflows could save the cache as _state. Also useful as you currently cannot use this action twice for independent runs as the runs would pick up the same state. With this change, it is possible to have one run close all PRs with label x after 7 days and another run close all PRs except those with label x after 10 days.

Also updated the README.md to show proper permissions needed.

Related issue:
#1137

Please also look into merging PR #1152 as this isn't necessarily useful if caching isn't 100% fixed.

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[VOVELEE]

I am hitting similar issue but this time it is because I have couple of runners working on the same VM. In this situation the user (under which the first runner operates) creates the folder and file and remains owner preventing other runners (running under different context) to have access to the tmp folder.

[autoantwort]

This solves the same problem as #1134. Here the user has to do manually work so solve this problem, with #1134 the user don't have to do anything. With this PR changes to the action configuration don't restart the process, with #1134 this will reset the progress.