fix: alert submit e2e failures because of reactive superform creation

[AdityaHegde]

We need to keep the form instance reactive to ensure data from explore updates the alert form. But this is causing issues around submit. Using the form id from the superForms to try and combat this.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

[AdityaHegde]

This didnt really help