Add default HTTP timeouts to helper wrappers

[shuofengzhang]

What changed

• Added a default timeout (DEFAULT_HTTP_TIMEOUT_SECONDS = 30) to all HTTP helper wrappers in matrix/utils/http.py:
  • post_url(..., timeout=...)
  • fetch_url(..., timeout=...)
  • fetch_url_sync(..., timeout=...)
• Passed the timeout through to underlying network calls (aiohttp and requests).
• Added unit tests in tests/unit/utils/test_http.py to verify timeout forwarding for async POST/GET and sync GET helpers.

Why

• These helpers are used for control-plane calls (health checks, container endpoints, orchestration paths).
• Without explicit timeouts, transient network stalls can block indefinitely, causing stuck jobs and delayed recovery.
• A bounded default keeps behavior safe by default while preserving flexibility (callers can still override timeout explicitly).

Insight / Why this matters

• Root cause: helper wrappers delegated directly to HTTP clients without setting timeouts, inheriting potentially unbounded wait behavior.
• Why easy to miss: localhost and healthy-network tests usually return quickly, so hangs only appear under partial outages or degraded endpoints.
• Impact: failures surface faster and retries/recovery loops can progress instead of hanging on a single blocked request.
• Tradeoff: a default timeout may surface timeout errors where callers previously waited forever; this is intentional for reliability and can be tuned per call.

Practical gain / Why this matters

• Improves reliability for users running Matrix in real distributed environments with intermittent endpoint issues.
• Reduces “stuck” orchestration symptoms by making helper-level network behavior deterministic.
• Provides regression protection via explicit timeout-forwarding tests.

Testing

• ✅ pytest -q tests/unit/utils/test_http.py
  • Result: 8 passed
• ✅ scripts/clone_and_test.sh facebookresearch/matrix
  • Result: 78 passed

Risk analysis

• Scope is narrow (HTTP helper wrappers + tests only).
• No behavior change for successful fast requests.
• Rollback-safe: removing default timeout behavior is straightforward if maintainers prefer a different default.

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