Update repository name references from python-testing to python-unit-testing

[Copilot]

Repository name changed from python-testing to python-unit-testing. All documentation and configuration references needed updating to reflect the new name.

Changes

• Documentation (README.md, SECURITY.md, CONTRIBUTING.md, CHANGELOG.md): Updated titles, URLs, and action references
• Implementation docs (.github/IMPLEMENTATION_SUMMARY.md, USAGE.md, QUICK_START.md): Updated titles, action usage examples, and issue links
• Workflows (.github/workflows/release.yml): Updated marketplace metadata

Examples

# Before
- uses: thoughtparametersllc/python-testing@v1

# After
- uses: thoughtparametersllc/python-unit-testing@v1

<!-- Before -->
# python-testing
[open an issue](https://github.com/thoughtparametersllc/python-testing/issues)

<!-- After -->
# python-unit-testing
[open an issue](https://github.com/thoughtparametersllc/python-unit-testing/issues)

40+ references updated across 8 files. All python-testing → python-unit-testing, all "Python Testing" → "Python Unit Testing".

Original prompt

Update all text that says python-testing or Python Testing and change it to Python Unit Testing or python-unit-testing based on its context.

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[Copilot]

Pull request overview

This PR updates all references to reflect the repository name change from python-testing to python-unit-testing. The changes ensure consistency across documentation, workflows, and configuration files.

• Updated repository name in all documentation files (README, SECURITY, CONTRIBUTING, CHANGELOG)
• Updated action usage examples across implementation guides (USAGE, QUICK_START, IMPLEMENTATION_SUMMARY)
• Updated workflow metadata to reflect the new marketplace name

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
SECURITY.md	Updated email subject line reference from python-testing to python-unit-testing
README.md	Updated repository title, marketplace badge, action usage examples (5 instances), and issue tracker URL
CONTRIBUTING.md	Updated document title and git clone URLs to use new repository name
CHANGELOG.md	Updated historical changelog entries to reflect corrected repository name references
.github/workflows/release.yml	Updated marketplace metadata output to show "Python Unit Testing" as the action name
.github/USAGE.md	Updated document title, description, and all action usage examples (10 instances) plus issue tracker URL
.github/QUICK_START.md	Updated guide introduction and all action usage examples (4 instances) plus issue tracker URL
.github/IMPLEMENTATION_SUMMARY.md	Updated document title, overview text, directory structure example, usage examples (3 instances), and support URL

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