Dispatch CI after changelog commits

[akirk]

Summary

• Add manual dispatch support to the test workflow.
• Dispatch test, CS, and lint workflows after the changelog workflow creates its bot commit.

Testing

• composer check-cs
• ruby -e 'require "yaml"; ARGV.each { |f| YAML.load_file(f); puts "#{f}: ok" }' .github/workflows/test.yml .github/workflows/changelog.yml
• git diff --check

Changelog

• Automatically create a changelog entry from the details below

Type

• Fixed

Message

Run CI checks on PR heads after the changelog workflow adds its generated commit.

[github-actions]

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