fix: apply provided timeout value to ClientTimeout.total

[yellowsubmarine372]

Title

fix(aiohttp): set ClientTimeout.total to apply user-configured timeout

Relevant issues

Fixes #16394

Pre-Submission checklist

• I have added testing in the tests/litellm/ directory
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix
✅ Test

Changes

Sets ClientTimeout.total field in aiohttp_transport.py to match user-configured timeout value.

Why total=read:

• litellm's async accepts only timeout: Union[float, int], which gets applied equally to all httpx timeout components(read, pool, connect)
• Using read for total maintains this consistency
• Matches behavior of other providers (Anthropic, Bedrock, OpenAI)

Testing:
Added 3 tests in test_aiohttp_transport.py:

• test_handle_async_request_total_timeout_triggers: verifies that a slow streaming response raises httpx.TimeoutException once the user timeout elapses.

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