[EASI-4614] Fix duplicate GRB Role types

[ClayBenson94]

EASI-4614

Description

Removes some duplication of enum types related to GRB Roles (Reviewer Role & Voting Role).

Important

The main thing to consider when we're using these auto-generated types is that they're not used in any map[string]interface{}-style resolvers (i.e. anything that uses ApplyChanges)
This doesn't appear to be the case here, but reviewers should confirm that this is the case!

How to test this change

• Taking UI actions to add GRB reviewers, fetch the list of reviewers, and create GRB discussions should be enough to validate that these role types work
• Additionally, since these changes involved a lot of find & replace, ensure that all references were properly updated

PR Author Checklist

• I have provided a detailed description of the changes in this PR.
• I have provided clear instructions on how to test the changes in this PR.
• I have updated tests or written new tests as appropriate in this PR.

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• It's best to pull the branch locally and test it, rather than just looking at the code online!
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  • e.g. "Approving because I tested it locally and all functionality works as expected"
  • e.g. "Approving because the change is simple and matches the Figma design"
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[mynar7]

less code, checks out

[github-actions]

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