Formatting Issues with ICBundle Workflow

[dzbaker]

Describe the bug
Similar to nasa/cFE#2419. There are some small formatting issues that should be corrected in the changelog/version.h updates made by the ICBundle workflow:

1. An additional "#" is placed in front of "#Changelog" in Changelog.md
2. An additional "#" is placed in front of "#define OS_BUILD_NUMBER ..." in src/os/inc/osapi-version.h
3. Additional occurrences of the string "Changelog" are replaced in the Changelog.md file

To Reproduce
Steps to reproduce the behavior:

1. Push a code change to a user-owned feature branch
2. Submit a pull request for that code change
3. Go to the "Actions" tab in GitHub and run the "Integration Candidate Bundle Generation" workflow with the PR number as the input argument for the field labeled "The pull request numbers to include (Comma separated):"
4. Wait for the workflow to complete
5. Inspect the newly updated/generated "integration-candidate branch"
6. Observe the changes made to the Changelog.md and src/os/inc/osapi-version.h files by the workflow

Expected behavior

1. No additional "#" is placed in front of "#Changelog" in Changelog.md
2. No additional "#" is placed in front of "#define OS_BUILD_NUMBER ..." in src/os/inc/osapi-version.h
3. Additional occurrences of the string "Changelog" are not replaced in the Changelog.md file

System observed on:
GitHub

Reporter Info
Dylan Z. Baker/NASA GSFC