Refactos: GraphQL Server to Remove unused RBAC's

[RipulHandoo]

Proposed changes

Removed deprecated and unused RBACs:

• Checked for the Deprecated/Unused RBAC in roles.go.
  
• Deleted RBAC definition for SyncHub

Types of changes

What types of changes does your code introduce to Litmus? Put an x in the boxes that apply

• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices applies)

Checklist

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• I have read the CONTRIBUTING doc
• I have signed the commit for DCO to be passed.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Dependency

• Please add the links to the dependent PR need to be merged before this (if any).

Special notes for your reviewer:

This PR solve issue #4120, by removing the unused RBAC's

[SohamRatnaparkhi]

LGTM 🚀

[namkyu1999]

Hey @RipulHandoo , Can you check build-pipeline / docker-build-graphql-server (pull_request) ?

[RipulHandoo]

Hey @RipulHandoo , Can you check build-pipeline / docker-build-graphql-server (pull_request) ?

@namkyu1999 PTAL!

[namkyu1999]

Check my comments, please!