Part nasa/cFS#1079, Adding specialty PR templates and links to the specialty PR templates in the default PR template.

[dzbaker]

Description of Change

Adding specialty PR templates to this repository and adding links to these templates in the default PR template.

Linked Issue

Partially Closes nasa/cFS#1079

Areas of Expertise Touched

• ASTRO
• CI/CD
• COSMOS
• Cybersecurity
• Docker
• EDS
• Git
• PSPs
• SBN
• SMP
• Tables
• TSN
• Unit Tests
• Other

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Author Checklist

• Linked GitHub issue is referenced above/linked to this PR
• Documentation generation workflow ran successfully on this branch
• Changes are limited to documentation/comments (no code behavior changes)

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Reviewer Checklist

• Documentation is clear, accurate, and complete
• Spelling and grammar reviewed
• Any links in the documentation have been verified to work
• Documentation generation workflow output looks correct
• Appropriate Expert areas have been reviewed

[arielswalker]

The default pull request template should be updated to link to the other PR templates, similar to cFE, cFS, OSAL. Example:

**For members of the cFS Team**
Click the `Preview` tab and select the pull request template corresponding to the type of change you are submitting:
- [Comment/Documentation Change](?expand=1&template=comment_documentation_change.md)
- [Tools Repository Change](?expand=1&template=tools_code_change.md)
- [Workflows Change](?expand=1&template=workflows_change.md)