updating ubuntu to version 22.04+ in github workflows; fixes #266

[rockett-m]

Updated ubuntu 20.04 to 22.04 in github workflows.

Many of the gh actions are deprecated so they need updates for ubuntu 22.04+ to work.

[rockett-m]

[edit ignore this - local clang issues resolved]

Before squash at the end, will have separate commits as many file changes are needed

• pure 20.04 to 22.04 gh workflow change and .cache/ added to .gitignore to avoid tracking clang created files
• clang format fixes for lint.sh
• manual code fixes to be c++ 20 compliant for lint.sh

[rockett-m]

@HalosGhost ready for review

Work done

• updated remaining gh workflows at ubuntu version 20.04 to 22.04
• updated gh workflow actions to latest integer release versions
• fixed lint error to get ci::lint passing

Speedups

• 500% stage speedup on 'CI / doxygen (pull_request)'
• 10% stage speedup on 'CI / Unit and Integration Tests (pull_request)'
• 5% stage speedup on 'CI / Build Release Candidate (pull_request)'

[HalosGhost]

Just double-checking: this does not include fixes for act for local testing right? So, this is purely a freshening of the versions (both container image and actions) in the CI?

[rockett-m]

@HalosGhost correct

[HalosGhost]

ut-ACK (unable to test locally due to act still failing). This looks like a simple version upgrade (both github actions versions and container image versions), along with the one linting fix required by those same changes.

Looks good to me.