Suppress ConnectionResetError

[drew2a]

This PR fixes #7345 by suppressing ConnectionResetError.

ConnectionResetError can be raised in three cases:

1. there is no aiohttp connection
2. aiohttp transport is None
3. aiohttp transport is closing

https://github.com/aio-libs/aiohttp/blob/29b6f302ad6736f71ef3fb029d4c5bac786a2fb7/aiohttp/http_writer.py#L69-L76

    def _write(self, chunk: bytes) -> None:
        size = len(chunk)
        self.buffer_size += size
        self.output_size += size
        transport = self.transport
        if not self._protocol.connected or transport is None or transport.is_closing():
            raise ConnectionResetError("Cannot write to closing transport")
        transport.write(chunk)

In all cases described above, we cannot do anything from the core side. All reconnect logic is on the GUI side.

The most probable root cause of the error is the situation in which the GUI goes through the shutdown procedure and closes the connection with the core. For this particular case, ConnectionResetError should be ignored on the core side anyway.

There is another way to fix the issue (@kozlovsky suggestion).

To fix it, we need:

• Cancel all requests to Core only after the response to the shutdown request is received, not earlier;
• Suppress ConnectionResetError in Sentry if Core is in the shutdown state.

However, this fix requires much more work, increases the complexity of the GUI-core interactions, and involves Sentry for suppressing the specific error.

Since this is not a critical issue to address, it is better to fix it in the most straightforward and simple way.