fix: harden JetBrains remote config sync to prevent IDE freezes

[RomneyDa]

Summary

• Remove service<ContinueSentryService>().report(...) from the remote config sync catch block — this call could itself throw from the background executor thread, letting the original exception escape and silently killing all future scheduled sync runs (a ScheduledFuture stops rescheduling when the runnable throws)
• Replace with Logger.warn() so sync failures are visible in the IDEA log
• Add explicit connectTimeout(5000) / readTimeout(5000) to prevent a hung remote server from blocking the shared AppScheduledExecutorService indefinitely
• Early-return in both syncRemoteConfig() and addRemoteSyncJob() when remoteConfigServerUrl is not configured, so no work is done at all for users who don't use this deprecated setting
• Remove redundant addRemoteSyncJob() call from reset(), which only restores UI fields from saved state

Ref: #8606 (comment)

Test plan

• Verify IDE starts without freezing when remoteConfigServerUrl is not set (default)
• Verify remote config sync still works when a valid URL is configured
• Verify sync failure with an invalid/unreachable URL logs a warning and doesn't freeze the IDE
• Verify sync failure doesn't prevent future sync attempts

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Summary by cubic

Prevents IDE freezes by hardening the JetBrains remote config sync. Failures now log without killing future runs, and hung servers no longer block the shared executor.

• Bug Fixes
  • Replaced service<ContinueSentryService>().report(...) with Logger.warn() so exceptions don’t escape the scheduler thread.
  • Added connectTimeout(5000) and readTimeout(5000) to HttpRequests to avoid blocking AppScheduledExecutorService.
  • Early-return when remoteConfigServerUrl is empty in both syncRemoteConfig() and addRemoteSyncJob().
  • Always cancel any existing remoteSyncFuture before scheduling; removed redundant addRemoteSyncJob() from reset().

^{Written for commit 4a85441. Summary will update on new commits.}

[continue]

No documentation updates needed for this PR.

This is an internal bug fix that hardens the JetBrains remote config sync implementation to prevent IDE freezes. The changes (adding timeouts, improving error handling, code cleanup) don't affect any user-facing behavior or APIs. The remote config sync feature continues to work the same way from a user's perspective—it just operates more reliably now.

Additionally, the remoteConfigServerUrl setting mentioned in the PR is a deprecated feature that isn't documented in the Continue docs.

[cubic-dev-ai]

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