fix(frontend): remove LaunchDarkly local storage bootstrapping (#12606)

### Why / What / How

<!-- Why: Why does this PR exist? What problem does it solve, or what's
broken/missing without it? -->
This PR fixes
[BUILDER-7HD](https://sentry.io/organizations/significant-gravitas/issues/7374387984/).
The issue was that: LaunchDarkly SDK fails to construct streaming URL
due to non-string `_url` from malformed `localStorage` bootstrap data.
<!-- What: What does this PR change? Summarize the changes at a high
level. -->
Removed the `bootstrap: "localStorage"` option from the LaunchDarkly
provider configuration.
<!-- How: How does it work? Describe the approach, key implementation
details, or architecture decisions. -->
This change ensures that LaunchDarkly no longer attempts to load initial
feature flag values from local storage. Flag values will now always be
fetched directly from the LaunchDarkly service, preventing potential
issues with stale local storage data.

### Changes 🏗️

<!-- List the key changes. Keep it higher level than the diff but
specific enough to highlight what's new/modified. -->
- Removed the `bootstrap: "localStorage"` option from the LaunchDarkly
provider configuration.
- LaunchDarkly will now always fetch flag values directly from its
service, bypassing local storage.

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [ ] I have made a test plan
- [ ] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
- [ ] Verify that LaunchDarkly flags are loaded correctly without
issues.
- [ ] Ensure no errors related to `localStorage` or streaming URL
construction appear in the console.

<details>
  <summary>Example test plan</summary>
  
  - [ ] Create from scratch and execute an agent with at least 3 blocks
- [ ] Import an agent from file upload, and confirm it executes
correctly
  - [ ] Upload agent to marketplace
- [ ] Import an agent from marketplace and confirm it executes correctly
  - [ ] Edit an agent from monitor, and confirm it executes correctly
</details>

#### For configuration changes:

- [ ] `.env.default` is updated or already compatible with my changes
- [ ] `docker-compose.yml` is updated or already compatible with my
changes
- [ ] I have included a list of my configuration changes in the PR
description (under **Changes**)

<details>
  <summary>Examples of configuration changes</summary>

  - Changing ports
  - Adding new services that need to communicate with each other
  - Secrets or environment variable changes
  - New or infrastructure changes such as databases
</details>

---------

Co-authored-by: Zamil Majdy <zamil.majdy@agpt.co>
Co-authored-by: seer-by-sentry[bot] <157164994+seer-by-sentry[bot]@users.noreply.github.com>

autogpt_platform/frontend/src/services/feature-flags/feature-flag-provider.tsx

@@ -52,7 +52,6 @@ export function LaunchDarklyProvider({ children }: { children: ReactNode }) {
       timeout={LAUNCHDARKLY_INIT_TIMEOUT_MS}
       reactOptions={{ useCamelCaseFlagKeys: false }}
       options={{
-        bootstrap: "localStorage",
         inspectors: [Sentry.buildLaunchDarklyFlagUsedHandler()],
       }}
     >