Mahathi - Implement production identity validation flow Frontend

[mahathiganimi]

Description

https://docs.google.com/document/d/1rZDo_yYs5rUyHDkA_3HfPxdiOLaRzmQ509gr6QA2kys/edit?tab=t.0

Related PRS (if any):

This frontend PR is related to the #2289 backend PR.

Main changes explained:

Added Production Identity verification UX in Create New User:

1. Production email/password inputs
2. Verify action with loading/error/success states
3. Auto-population and lock of first name/last name/email after successful verify
4. Sends productionVerificationToken on create request
   See UserProfileAdd.jsx
5. Added read-only behavior for identity fields on profile edit when identityLocked is true in UserProfileEdit.jsx

How to test:

1. Check into current branch
2. Make sure to add REACT_APP_PRODUCTION_IDENTITY_VERIFICATION_ENABLED=true to HighestGoodNetwork .env file
3. Checkout the related backend branch and start the backend.
4. Do npm install and restart both servers, do npm run start:local on frontend to run this PR locally
5. Log as admin user
6. Navigate to dashboard→ OtherLinks→ UserManagement→ CreateNewUser
   a. Verify that the Production Identity section (Production Email, Production Password, and Verify Production Identity button) is visible.
   b. Enter valid Production credentials and click Verify Production Identity. Confirm that verification succeeds, the user's first name, last name, and email are auto-populated, and those fields become read-only.
   c. Repeat the verification using a non-existent Production email. Verify that an error is displayed indicating that no matching Production account exists.
   d. Repeat the verification using a valid Production email with an incorrect password. Verify that an authentication error is displayed indicating the credentials are invalid.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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