chore(x2a): job-script gitignore issues

[yray-pixel]

Fixes FLPATH-4383

Problem

When source/target repositories have .gitignore rules blocking files like migration-plan.md, the x2a job script
would create these files but silently fail to commit them to the target repository.

Solution

1. Include gitignored files when detecting changes: git ls-files --others --ignored --exclude-standard
2. Force-add each file individually with git add -f "$file" (directory-level -f still respects .gitignore)

Testing

✅ Tested with nginx-example repo that has migration-plan.md in .gitignore
✅ Verified migration-plan.md is now committed in both init and analyze phases
✅ Tested nested directories with gitignored files
✅ Verified normal (non-gitignored) files still work correctly
✅ Verified empty PROJECT_DIR doesn't cause errors

Changes

• Modified copy_changed_files() to include gitignored files
• Modified cleanup() to force-add files individually
• Added logging: "Processed X file(s) in PROJECT_DIR/"

[rhdh-gh-app]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @red-hat-developer-hub/backstage-plugin-x2a-backend

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-x2a-backend	workspaces/x2a/plugins/x2a-backend	none	v1.6.0

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud