Adjustments to test charm upgrades

[addyess]

Overview

Create tests that performs a charm upgrade from k8s edge --> k8s local_path

Details

• eliminates k8s-worker leader from checking node readiness on pre-upgrade-check action
• k8s leader is responsible for checking the whole cluster on pre-upgrade-check
• k8s checks kube-system namespace to ensure all pods are ready during update-status event
• heavy refactor of integration test conftest.py to support test configuration by pytest model markings
• latest/edge snap is now 1.32, requiring new dependency literals
• increase runner size for amd64 runs

Note

VMs on LXD cannot pull an image for focal that supports cilium. This PR moves all testing on amd64 therefore to jammy rather than focal. Focal is still tested on arm64 due to GH ARM64 workers not supporting /dev/kvm

[addyess]

labels are now "OPTIONAL"

[addyess]

arm64 -- you stay testing on focal so we can know if we break focal compatability

[mateoflorido]

Great job! Thanks for adding testing for the upgrades and improving the stability of the suite.

[github-actions]

Test coverage for b1a3178

coverage-report: install_deps /home/runner/work/k8s-operator/k8s-operator/charms/worker/k8s> python -I -m pip install 'coverage[toml]'
coverage-report: commands[0] /home/runner/work/k8s-operator/k8s-operator/charms/worker/k8s> coverage report
Name                                    Stmts   Miss  Cover
-----------------------------------------------------------
lib/charms/k8s/v0/k8sd_api_manager.py     278     29    90%
src/charm.py                              500    260    48%
src/cloud_integration.py                   80      3    96%
src/config/extra_args.py                   29      2    93%
src/containerd.py                         140     22    84%
src/cos_integration.py                     33     12    64%
src/events/update_status.py                68     24    65%
src/inspector.py                           41      4    90%
src/kube_control.py                        39     31    21%
src/literals.py                            21      0   100%
src/protocols.py                           28      5    82%
src/reschedule.py                          77      4    95%
src/snap.py                               185     26    86%
src/token_distributor.py                  181    109    40%
src/upgrade.py                            108     48    56%
-----------------------------------------------------------
TOTAL                                    1808    579    68%
coverage-report: OK (1.32=setup[1.09]+cmd[0.23] seconds)
congratulations :) (1.37 seconds)

Static code analysis report

Run started:2024-12-18 04:53:00.314346

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 3847
  Total lines skipped (#nosec): 3
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):