[ci] Mirror dispatched wiki tests as required statuses

[coisa]

Related Issue

Refs #230

Motivation / Context

• PR [dependencies] Add shadow dependency audit option #234 fixed part of the wiki pointer problem by dispatching tests.yml after bot-authored .github/wiki pointer commits.
• PR [reports] Validate published HTML with proof-html #235 showed the remaining gap: the workflow-dispatched test run can execute and pass on the bot-authored SHA, but GitHub branch protection may still keep the required Run Tests (8.3), Run Tests (8.4), and Run Tests (8.5) contexts pending because the run was not created by the normal pull_request event.

Changes

• Add a publish-required-statuses input to the reusable and packaged tests workflows.
• When enabled, mirror the matrix result into commit statuses named exactly like the required Run Tests contexts.
• Dispatch the wiki pointer follow-up test run with publish-required-statuses=true.
• Document why workflow-dispatched test runs need commit-status mirroring for bot-authored wiki pointer commits.

Verification

• composer dev-tools
• Focused command(s): composer dev-tools code-style -- --fix --json
• Focused command(s): composer dev-tools changelog:check
• Manual verification: ruby -e 'require "yaml"; %w[.github/workflows/tests.yml .github/workflows/wiki-preview.yml resources/github-actions/tests.yml].each { |f| YAML.load_file(f); puts "#{f}: ok" }'
• Manual verification: git diff --check

Documentation / Generated Output

• README updated
• docs/ updated
• Generated or synchronized output reviewed

Changelog

• Added a notable CHANGELOG.md entry

Reviewer Notes

• This is deliberately split out from the closed proof-html experiment in PR [reports] Validate published HTML with proof-html #235. The HTML validation work was abandoned, but this CI fix is still needed for the earlier wiki pointer required-check problem.
• I did not run the full composer dev-tools locally because this branch only changes workflows/docs/changelog and the repository pre-commit composer_script has recently timed out at 120 seconds while running that full suite. The focused fix/check commands above passed before commit.

[github-actions]

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• Docs: https://php-fast-forward.github.io/dev-tools/previews/pr-236/
• Coverage: https://php-fast-forward.github.io/dev-tools/previews/pr-236/coverage/
• Metrics: https://php-fast-forward.github.io/dev-tools/previews/pr-236/metrics/