Fix #566, Adds CCB Agenda generation workflow

[chillfig]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fixes Automate generation of CCB Agenda #566

Testing performed
Test on fork: https://github.com/chillfig/cFS/actions/runs/3338091197

1. Navigate to "update wiki" action (https://github.com/chillfig/cFS/actions/workflows/cfs-wiki.yml)
2. Click "Run workflow" drop-down on right-hand side of screen
3. For "Use workflow from", select "ccbAgenda" branch.
4. Click green button "Run workflow"
   5.) Navigate to "update wiki" action and observe newly created "ccb-agenda" artifact.

Expected behavior changes
User can use this workflow to update the nasa/cFS wiki page with a new CCB agenda markdown file, and other updates to the wiki page's _Sidebar.md and Home.md files. The workflow can be ran any day of the week and appropriately handle correct date stamping. The CCB agenda markdown file generated with this workflow is ordered from top to bottom of authors with pull requests totaling least additions/deletions to most. A user manually runs this workflow from the Actions tab of nasa/cFS.

System(s) tested on
Forked cFS wiki: https://github.com/chillfig/cFS/wiki

Additional context
N/A

Code contributions
The cFS repository is provided to bundle the cFS Framework. It is utilized for bundling submodules, continuous integration testing, and version management and does not contain any software. Code contributions should be directed to the appropriate submodule.

Contributor Info - All information REQUIRED for consideration of pull request
Justin Figueroa, Vantage Systems