Add aiohttp to apiview requirements to fix API.md consistency check

[EldertGrootenboer]

Problem

The API.md Consistency check (apistub / apiview-stub-generator) builds the API stub by importing the whole package. For azure-servicebus, importing azure.servicebus.aio.management._management_client_async eagerly imports AioHttpTransport from azure.core.pipeline.transport, which requires aiohttp. The apiview requirements environment did not include aiohttp, so stub generation failed with:

ModuleNotFoundError: No module named 'aiohttp'

This made the consistency check fail on any azure-servicebus PR (and any other package whose import graph reaches AioHttpTransport), blocking merges.

Fix

Add aiohttp to eng/apiview_reqs.txt so the API.md consistency environment can import packages that reference the aiohttp-based transport.

Notes

Extracted from #45142 so this engineering-environment fix lands independently of the feature change.

[Copilot]

Pull request overview

Adds aiohttp to the API.md consistency (apiview stub generation) requirements so packages that import AioHttpTransport can be imported successfully during stub generation in CI.

Changes:

• Add a pinned aiohttp dependency to eng/apiview_reqs.txt used by the API.md consistency workflow.