Move read_text to executor (#5688)

* Move read_text to executor

* Fix issues found by coderabbit

* formated to formatted

* switch to async_capture_exception

* Find and replace got one too many

* Update patch mock to async_capture_exception

* Drop Sentry capture from format_message

The error handling got introduced in #2052, however, #2100 essentially
makes sure there will never be a byte object passed to this function.
And even if, the Sentry aiohttp plug-in will properly catch such an
exception.

---------

Co-authored-by: Stefan Agner <stefan@agner.ch>

tests/utils/test_log_format.py

@@ -19,9 +19,3 @@ def test_format_message_port_alternative():
         format_message(message)
         == "Port '80' is already in use by something else on the host."
     )
-
-
-def test_exeption():
-    """Tests the exception handling."""
-    message = b"byte"
-    assert format_message(message) == message