## Summary
Backport of PR #6144 to the `rh-test` branch.
This adds build time feature flags system starting with a flag that
indicates whether subscription is required to use the app. This is only
used on cloud.
## Changes
- Added build feature flags system via `__BUILD_FLAGS__` global
- Added `REQUIRE_SUBSCRIPTION` flag that can be set via environment
variable
- Conditionally load subscription-related components based on the flag
- Updated run button logic to respect the subscription requirement flag
- Updated settings UI to show subscription panel only when required
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6147-Backport-make-require-subscription-toggleable-in-build-to-rh-test-2916d73d365081e89bcfc4502315a812)
by [Unito](https://www.unito.io)
- Add @ts-expect-error directive to unused postSurveyStatus function in auth.ts
- Add @ts-expect-error for .mts import extension in vite.electron.config.mts
- Add @ts-expect-error directives for global variable assignments in vitest.setup.ts
- Remove vite.electron.config.mts from ESLint allowDefaultProject to fix duplicate inclusion error
