PYTHON-5433: Create an sbom-requirements.txt file to capture optional dependencies

[Jibola]

PYTHON-5433

Changes in this PR

• Introduced a generate_sbom_requirements.py file dedicated to pulling combining all of the requirements.txt files and using that requirements file to create frozen environment.

Test Plan

• Ran the GHA against this branch

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).
• Did you use AI?
  • Yes, I used it to help generate the generate_sbom_requirements.py file. I manually reviewed the code and heavily augmented the initial output to meet my standards.

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[blink1073]

LGTM!