Re-open Prompt for Invalid Repos

[joyngjr]

Summary:

Fixes #204

Type of change:

• ✨ Enhancement

Changes Made:

• Reopen repo-change-form when users try to change to an invalid repository

Screenshots:

Screen.Recording.2023-09-25.at.6.40.12.PM.mov

Proposed Commit Message:

Enhance error handling for switching to invalid repos.

Let's re-open the page to change repos when an invalid one is entered.

Checklist:

• I have tested my changes thoroughly.
• I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[gycgabriel]

LGTM