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chore(AI): etagByEnv flag cleanup (#10560)

This PR cleans up the etagByEnv flag. These changes were automatically
generated by AI and should be reviewed carefully.

Fixes #10556

## 🧹 AI Flag Cleanup Summary
This change removes the `etagByEnv` feature flag and makes its
functionality
permanent. This modifies the ETag generation for client API requests to
be
environment-specific, improving caching efficiency. The cleanup involved
removing the flag definition, updating the controller logic to
permanently use
the environment-specific ETag calculation, and refactoring the
corresponding E2E
tests to only cover the enabled behavior.
### 🚮 Removed
- **Flag Definition**
- The `etagByEnv` flag from `IFlagKey` in
`src/lib/types/experimental.ts`.
- **Conditional Logic**
- The check for the `etagByEnv` flag in `calculateMeta` method in

`src/lib/features/client-feature-toggles/client-feature-toggle.controller.ts`.
- **Tests**
- Test cases in `src/test/e2e/api/client/feature.optimal304.e2e.test.ts`
that
covered the disabled state of the `etagByEnv` flag.
### 🛠 Kept
- **Environment-Specific ETags**
- The behavior of generating environment-specific ETags is now the
default and
only behavior.
- **Tests**
- E2E tests verifying the functionality of environment-specific ETags
have
been retained and simplified.
### 📝 Why
The `etagByEnv` feature has been successfully rolled out and validated.
By
removing the feature flag and associated conditional logic, we simplify
the
codebase, reduce complexity, and make it easier to maintain. This change
makes
the improved ETag generation strategy a permanent part of the system.

---------

Co-authored-by: unleash-bot <194219037+unleash-bot[bot]@users.noreply.github.com>
Co-authored-by: Gastón Fournier <gaston@getunleash.io>

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