[96833] [96834] Appoint a Rep update rep select validation logic

[jvcAdHoc]

Are you removing, renaming or moving a folder in this PR?

• [x] No, I'm not changing any folders (skip to TeamSites and delete the rest of this section)
• [ ] Yes, I'm removing, renaming or moving a folder

Did you change site-wide styles, platform utilities or other infrastructure?

• [x] No
• [ ] Yes, and I used the proxy-rewrite steps to test the injected header scenario

Summary

• This pr updates the handleGoForward logic to account for the case when a search has not occurred yet which should trigger the no search error, not the no selection error
• This pr updates the no selection error text

Related issue(s)

• 96833
• 96834

Testing done

• Went through the flow locally testing search and selection combinations

Screenshots

Before

https://github.com/user-attachments/assets/1b0a052d-471d-436a-b7cb-a84ab71fbe1c

After

https://github.com/user-attachments/assets/e19f46b5-073f-46c7-8336-193addac229c

What areas of the site does it impact?

Appoint a Rep Form 21-22 and 21-22a

Acceptance criteria

Quality Assurance & Testing

• [ ] I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• [ ] No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• [ ] Linting warnings have been addressed
• [ ] Documentation has been updated (link to documentation *if necessary)
• [ ] Screenshot of the developed feature is added
• [ ] Accessibility testing has been performed

Error Handling

• [ ] Browser console contains no warnings or errors.
• [ ] Events are being sent to the appropriate logging solution
• [ ] Feature/bug has a monitor built into Datadog or Grafana (if applicable)

Authentication

• [x] Did you login to a local build and verify all authenticated routes work as expected with a test user