Improve tests and checks CI/CD pipelines

[AmintorDusko]

Context:
Checks and tests are, at the moment, slowing down the CI/CD pipeline.
Some have a running time greater than 20 minutes.

Description of the Change:
Introduction of Kokkos caching for tests and checks, and removal of redundancies.

Benefits:
The expected benefit is to have tests and checks running in less than 10 minutes.

Possible Drawbacks:
Not aware of any.

Related GitHub Issues:
#352

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit .github/CHANGELOG.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[AmintorDusko]

[sc-25948]

[codecov]

Codecov Report

Merging #353 (3ddc301) into master (4c6c154) will decrease coverage by 1.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
- Coverage   99.78%   98.39%   -1.40%     
==========================================
  Files          49       49              
  Lines        4160     4163       +3     
==========================================
- Hits         4151     4096      -55     
- Misses          9       67      +58     

Impacted Files	Coverage Δ
pennylane_lightning/_version.py	100.00% <100.00%> (ø)
pennylane_lightning/lightning_qubit.py	100.00% <100.00%> (+0.37%)	⬆️
...ng/src/gates/cpu_kernels/GateImplementationsPI.hpp	94.74% <0.00%> (-5.26%)	⬇️
...ng/src/gates/cpu_kernels/GateImplementationsLM.hpp	96.11% <0.00%> (-3.89%)	⬇️
pennylane_lightning/src/util/Memory.hpp	100.00% <0.00%> (ø)
pennylane_lightning/src/util/BitUtil.hpp	100.00% <0.00%> (ø)
pennylane_lightning/src/util/RuntimeInfo.cpp	100.00% <0.00%> (ø)
pennylane_lightning/src/util/RuntimeInfo.hpp	100.00% <0.00%> (ø)
pennylane_lightning/src/util/ConstantUtil.hpp	100.00% <0.00%> (ø)
pennylane_lightning/src/algorithms/AlgUtil.hpp	100.00% <0.00%> (ø)
... and 15 more

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[AmintorDusko]

I intend to fill the changelog and merge this PR only after the Release.

[mlxd]

Thanks @AmintorDusko
A few comments below. Also, it may be worth updating all the runner images from 20.04 to 22.04.

[chaeyeunpark]

Nice job @AmintorDusko! Just few comments.

[multiphaseCFD]

Thanks @AmintorDusko for the nice work! No more comments from my side.

[chaeyeunpark]

Thanks for the work! I just have suggestions on the benchmark.

[chaeyeunpark]

Thanks again @AmintorDusko! I think @mlxd needs to change the required CI names in the settings (ubuntu-20.24 to ubuntu-22.04).

[AmintorDusko]

Thanks again @AmintorDusko! I think @mlxd needs to change the required CI names in the settings (ubuntu-20.24 to ubuntu-22.04).

@mlxd, I summon thee!

[mlxd]

Should we be concerned about the coverage drop?

[AmintorDusko]

Should we be concerned about the coverage drop?

I don't think so. This PR did nothing directly regarding coverage.
This might be a case of proportional change and not an effective change on coverage.
We increased the amount of tests only.

[AmintorDusko]

Should we be concerned about the coverage drop?

This might be work for other PR, though. The report shows that the drop in coverage is connected with cpu_kernels.