ci: rollout several recent changes to CI testing

[richm]

• Pass in a YAML true value as __bootc_validation: true using
  the --extra-vars option to ensure that __bootc_validation is
  treated as a boolean and not a string value.

-e "__bootc_validation: true"

You can also use JSON format:

-e '{"__bootc_validation": true}'

but YAML is simpler in this case.

• Use tox-lsr version 3.11.1

• Ensure the citest bad comment works when the test was cancelled in
  addition to the failure case.

• Update contributing.md documentation

• Update number of nodes to use in testing farm, if needed

• remove unnecessary ansible-lint skips

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Update CI testing workflows to use YAML booleans for validation, bump tox-lsr to 3.11.1, improve failure/cancellation detection, and expand local CI test documentation

CI:

• Upgrade tox-lsr to version 3.11.1 in all GitHub Actions workflows
• Pass __bootc_validation as a YAML boolean via --extra-vars in CI test invocations
• Extend the tft_citest_bad workflow to handle cancelled test runs as well as failures

Documentation:

• Add detailed instructions for running CI tests locally with tox-lsr and QEMU in contributing.md

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