Add SnippetFilter CRD

[salonichf5]

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: User wants to define a CRD for snippetsFilter to apply custom nginx configurations

Solution: Defined a CRD for snippetsFilter

Testing: Describe any testing that you did.

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

Closes #2415

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

[sjberman]

Let's create a feature branch and target this PR for that, since we're still trying to figure out the solution here.

[salonichf5]

Let's create a feature branch and target this PR for that, since we're still trying to figure out the solution here.

I have created this branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.21%. Comparing base (77114a2) to head (dccff20).
Report is 1 commits behind head on feature/snippets-filter.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/snippets-filter    #2472   +/-   ##
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  Coverage                    89.21%   89.21%           
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  Files                          100      100           
  Lines                         7539     7539           
  Branches                        50       50           
========================================================
  Hits                          6726     6726           
  Misses                         756      756           
  Partials                        57       57           

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[kate-osborn]

looks like feature branch needs to be rebased again

[sjberman]

This also needs to be added to the list in register.go.