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

## 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):**
* [X] US Region Restricted (e.g., Access Policy constraint)
* [X] FedRAMP High
* [X] 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.
* [X] I have checked if this functionality can be achieved by extending an existing module or blueprint.
* [X] I have verified that this does not duplicate existing functionality.

## Alternatives Considered

## Additional Context

Start by locating the cicd.tf files and modules containing Cloud Source Repositories or source repo references. Trace how those modules create CI/CD configuration and template triggers, then replace the identified references with Secure Source Manager integrations. Done means the old source-repo references are removed and the affected deployments support SSM-based triggers across the stated compliance contexts.

Written by the indexing model from the issue text.