fix: allow CI pipeline to fail if the Change Request changes scm-engine configuration file

[jippi]

If the Change Request does not change the scm-engine configuration file, we'll continue to fail open by succeeding the external pipeline as today.

This should prevent scm-engine configuration changes/bugs from blocking a regular Change Request not touching SCM Engine configuration files, and still provide more visual feedback to Change Requests with bad SCM-Engine configuration

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 2.44%. Comparing base (5e4b5df) to head (45754f6).

Files with missing lines	Patch %	Lines
cmd/shared.go	0.00%	3 Missing ⚠️
pkg/scm/gitlab/client.go	0.00%	3 Missing ⚠️
pkg/scm/github/context.go	0.00%	2 Missing ⚠️
pkg/scm/gitlab/context.go	0.00%	2 Missing ⚠️
pkg/state/context.go	0.00%	2 Missing ⚠️
pkg/scm/github/client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #80      +/-   ##
========================================
- Coverage   2.44%   2.44%   -0.01%     
========================================
  Files         48      48              
  Lines       2327    2334       +7     
========================================
  Hits          57      57              
- Misses      2262    2269       +7     
  Partials       8       8              

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