Schema version validation changes

[michael-valdron]

Please specify the area for this PR

index server

What does does this PR do / why we need it:

Changes contain the following:

• schema version validation error response code changed from 500 internal server to 400 bad request
• optional bugfix version allowed, e.g. both 2.2 and 2.2.0 are accepted schema versions

Which issue(s) this PR fixes:

Fixes #?

fixes devfile/api#1128

PR acceptance criteria:

• Test Coverage
  • Are your changes sufficiently tested, and are any applicable test cases added or updated to cover your changes?

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +3.40 🎉

Comparison is base (200b4f0) 42.28% compared to head (980b084) 45.69%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   42.28%   45.69%   +3.40%     
==========================================
  Files           6        6              
  Lines        1057     1057              
==========================================
+ Hits          447      483      +36     
+ Misses        567      533      -34     
+ Partials       43       41       -2     

Impacted Files	Coverage Δ
index/server/pkg/server/endpoint.go	42.85% <100.00%> (+7.34%)	⬆️

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[michael-valdron]

Testing against staging failing due to these changes to be tested not being merged and deployed to staging yet.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kim-tsao, michael-valdron
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