fix(build): add HTTP timeouts to managed-zccache download client

[zackees]

Summary

• Adds an explicit 10s connect timeout and 120s overall request timeout to the reqwest::blocking client used by the managed-zccache downloader (crates/fbuild-build/src/managed_zccache.rs).
• Without these, a stalled network path could block ensure() indefinitely and hang an fbuild build.

Follow-up to #572: CodeRabbit flagged this (Major) but the comment landed after #572 was squash-merged, so the fix is not on main.

Test plan

• soldr cargo check -p fbuild-build
• CI green

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 487d6ff5-6d62-47a8-bcaa-e93238e7c6d2

📥 Commits

Reviewing files that changed from the base of the PR and between 7a88889 and 5a23e77.

📒 Files selected for processing (1)

• crates/fbuild-build/src/managed_zccache.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/managed-zccache-http-timeouts

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