KernelIntrisics and related tweaks

[christiangnrd]

This PR:

• Tweaks KI methods and docstrings (non-breaking)
• Refactors the KI tests
• Adds a test for kernels with more than one block of shared memory
• Switches to a supported branch for testing backends with AcceleratedKernels as a dependency

[github-actions]

Your PR no longer requires formatting changes. Thank you for your contribution!

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.27%. Comparing base (03d4ab7) to head (d6dc85f).

Files with missing lines	Patch %	Lines
src/KernelAbstractions.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #666   +/-   ##
=======================================
  Coverage   52.27%   52.27%           
=======================================
  Files          22       22           
  Lines        1689     1689           
=======================================
  Hits          883      883           
  Misses        806      806           

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