ci: do not run ci tests by default, require citest comment or label [citest_skip]

[richm]

github action ci jobs are a precious resource - we only have 20 jobs - when multiple
PRs are submitted we may have to wait hours to get results. We need to be explicit
about where and when to run ci jobs.

With this change, when a PR is created or updated, CI tests will not run automatically.
A role maintainer (OWNER, MEMBER, COLLABORATOR, or systemroller) must either comment
on the PR or add a label:

• [citest_all] comment or citest_all label - run all CI tests, including checks
  and Testing Farm integration tests
• [citest_$test] comment or citest_$test label - run only that test - for
  example, [citest_ansible-lint] or the citest_ansible-lint label
• For Testing Farm, [citest_tft] / citest_tft runs those tests. [citest] /
  citest is still accepted for Testing Farm for backward compatibility.

Comments work on issue_comment; labels take effect when the PR is opened, when new
commits are pushed, or when the label is added. These labels are managed by
system roles .github automation.
See linux-system-roles/.github#186

If you use the gh command to interact with github, you can use
gh pr comment $PRNUM -b '[citest_all]'
or
gh pr edit $PRNUM --add-label citest_all

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

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