Separate Category and Capability Validation

[kevinrizza]

This commit removes the default set of category and capability validation as a part of the operatorhubio validator.

As we have a mechanism for custom category validation, and there is significantly more churn on that specific validation, this commit separates the default operatorhubio validator from a distinct default categories validator. This allows users that want to continue to use the default set of categories to still do so, and if there are custom categories they would like to include they are free to use the dynamic categories validation option instead.

This commit also does the same separation for capability validation. There is no implementation of custom capability validation (as there is less churn and no explicit need for that yet) -- adding custom capability validation should be trivial in a future commit.

This commit accomplishes this by deprecating the existing validator and creating a v2 version of the operatorhubio validator.

Additionally, this commit adds 'Observability' to the category list.

[openshift-ci]

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This pull-request has been approved by: kevinrizza

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[codecov]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (d52e6b2) 41.99% compared to head (e2aeec7) 42.64%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   41.99%   42.64%   +0.64%     
==========================================
  Files          39       42       +3     
  Lines        3512     3583      +71     
==========================================
+ Hits         1475     1528      +53     
- Misses       1891     1903      +12     
- Partials      146      152       +6     

Files	Coverage Δ
pkg/validation/internal/operatorhub.go	81.44% <100.00%> (+3.37%)	⬆️
pkg/validation/internal/standardcapabilities.go	78.94% <78.94%> (ø)
pkg/validation/internal/standardcategories.go	70.96% <70.96%> (ø)
pkg/validation/internal/operatorhubv2.go	68.42% <68.42%> (ø)

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[joelanford]

/lgtm