Github Actions Added to Block PRs from fork/main branch

[varshith257]

Which problem is this PR solving?

• Resolves [Feature]: Create GitHub Action to block PRs from ${fork}/main branch #2213

Description of the changes

• Added a workflow check in lint workflow to block PRs that are raised from the fork main branch.

How was this change tested?

• To be tested

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[varshith257]

@yurishkuro PTAL and approve the workflows to run

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (de8b022) to head (de38db6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2296   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files         254      254           
  Lines        7662     7662           
  Branches     1981     1996   +15     
=======================================
  Hits         7402     7402           
  Misses        260      260           

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