feat: deploy ux updates

:mag: Overview

Misc cleanup for the new depoy preview component, and updated styling and layout for the deploy states

Fixes and cleanup to DeployPreview
- Simplified the rendering logic for diffs
- Cleaned up typography, light theme fixes
- Removed js-base truncation
- Added posthog masking
Updated UI for deploy states
- Changed button variants for various states to better align with required user action: deployed -> secondary, deploy required -> primary
- Added icon for "Deploy" state
- Moved "undeployed changes made" alert banner above deploy button
- Updated alert copy to include number of changes
- Updated alert variant to info

Misc updates and improvements to UX for deploying secret changes

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