fix: [DM-4] add Vale linting

[darrickyong]

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This PR updates the allowed list so that vale . is error-free in the auth4genai folder.

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[mikemimik]

🤔 The output of the vale action is a little different than I expected. I thought that it would be similar to the terminal output you showed me @darrickyong when implementing this. My expectation was that the action would fail, not pass, and I'm curious why that is.

[mikemimik]

✋🏽 Change Request: There are some duplications in this file for terms already in the CodeTerms/ folder. Can we use claude to validate there are no duplicates.