Add configurable timeout for session.post() requests in remote.py

[SkipperNZ]

We are adapting SWE-Agent to solve Java tasks.
When the agent tries to build a project using Gradle, larger projects often fail due to timeout issues.

Currently, in runtime/remote.py, the requests are sent via the method:

async def _request()

Inside this method, the session.post() call does not specify a timeout parameter, which means it uses the default value of 300 seconds.
For larger projects, this is insufficient and causes premature failures.

I can merge default timeout in config.py

timeout_request: float = 300.0

And set in in _request

timeout=aiohttp.ClientTimeout(total=self._config.timeout_request)

If this approach looks good, i can merge this.