refactor: misc optimizations and ux improvements to secrets editing

[rohan-chaturvedi]

:mag: Overview

The current secrets editing experience has several and ux and implementation issues:

• Secret 'create' and 'edit' actions are done client-side and can be reviewed before deploy, but 'delete' actions are instantly applied to the server. This behavior is inconsistent and unintuitive
• The highlight coloring for secrets that have been edited is not informative enough. There is no distinction between new secrets and edited secrets, and only secret keys are colored
• The 'deploy' process is extremely inefficient:
  • Each secret create or edit is an individual mutation
  • Each mutation refetches secrets on completion
  • The code to handle all these promises is unncessarily complex as a result
• There is no loading spinner when deploying a large number (5+) changes in a single action

:bulb: Proposed Changes

• Make secret deletes behave identically to edit and create actions, i.e client side first, and applied server-side only on clicking "deploy"
• Process all changes in a single "deploy" action together:
  • Bulk create all new secrets
  • Bulk edit all updated secrets
  • Bulk delete all deleted secrets
  • Refetch secrets from the server only once, after the bulk operation is complete
• Improve the UI indication of which secrets are created, edited or deleted before clicking "deploy"
• Add a loading spinner for the "deploy" action

:framed_picture: Screenshots or Demo

https://github.com/user-attachments/assets/7e7ba8b0-7041-470a-9112-9e4ea864bd84

:memo: Release Notes

• Several optimizations and UX improvements to editing and deploying secret changes

:dart: Reviewer Focus

• Verify that all secret crud operations are saved correctly
• Check that all secret updates are processed in a single mutation

:green_heart: Did You...

• [x] Ensure linting passes (code style checks)? ~~- [ ] Update dependencies and lockfiles (if required)~~
• [x] Regenerate graphql schema and types (if required)
• [x] Verify the app builds locally?
• [ ] Manually test the changes on different browsers/devices?