[Feature Request] Remove Source Repo references and modules and replace with SSM

[Calvin-Cheng1]

Feature Description

This feature allows Secure Source Manager to used as an option for cicd and creates template triggers.

Use Case

Cloud Source Repositories has been deprecated since 2024 and should not be used anymore. Secure Source Manager is the replacement service for it.

Proposed Solution

Update all previous references to source repo in the cicd.tf files and modules to use SSM instead.

Compliance & Deployment Context

• Target Deployment Type(s):
  • US Region Restricted (e.g., Access Policy constraint)
  • FedRAMP High
  • FedRAMP Moderate
  • DoD IL4
  • DoD IL5
  • [] All / General
• Relevant NIST 800-53r5 Controls: (If applicable, list the controls this feature helps satisfy)

Reusability Check

Stellar Engine prioritizes reusability.

• I have checked if this functionality can be achieved by extending an existing module or blueprint.
• I have verified that this does not duplicate existing functionality.

Alternatives Considered

Additional Context