Remove foreground check from sendRequestWithTimeout

[luizgrp]

WHAT

Remove foreground check from sendRequestWithTimeout.

For future reference, it was added in #1728.

WHY

From @garanj:

I don't think the one in sendRequestWithTimeout should exist: There's nothing in that which requires a foreground for it to be valid request, where as (for example) starting a remote activity should have the foreground check. sendRequestWithTimeout could be used for use cases that don't need a foreground check.

Checklist 📋

• [N/A] Add explicit visibility modifier and explicit return types for public declarations
• Run spotless check
• Run tests
• [N/A] Update metalava's signature text files