feat(appset): Restrict scm provider urls (#14286) Cherry Pick 2.8

[speedfl]

• 9353: Restrict scm provider urls

• 9353: Enforce restriction

• 9353: Fix after review

• 9353: Remove comment

• 9353: Fix units tests

• 9353: Code review, update comment

• 9353: Code review, update comment 2

• 9353: Remove doc issues

• 9353: Fix e2e

• 9353: Fix e2e goTemplate

• 9353: Fix e2e pullRequestGenerator

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Cherry pick job failed

@crenshaw-dev @ishitasequeira

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[codecov]

Codecov Report

Patch coverage: 78.84% and project coverage change: +0.09% 🎉

Comparison is base (7852e44) 49.80% compared to head (699de3d) 49.90%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.8   #14779      +/-   ##
===============================================
+ Coverage        49.80%   49.90%   +0.09%     
===============================================
  Files              261      261              
  Lines            44884    44927      +43     
===============================================
+ Hits             22356    22421      +65     
+ Misses           20322    20301      -21     
+ Partials          2206     2205       -1     

Files Changed	Coverage Δ
applicationset/generators/scm_provider.go	43.21% <68.57%> (+9.88%)	⬆️
applicationset/generators/pull_request.go	60.11% <100.00%> (+15.39%)	⬆️

... and 2 files with indirect coverage changes

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