### Description

Currently, when the event loop is blocked for more than 0.2 seconds, an error message is logged to the Triggerer notifying the user that the async thread was blocked, likely due to a badly written trigger. 
The issue with this message is that there currently no support for async DB reads. So whenever a DB read is performed (for getting connection information etc.) the event loop is blocked for a short while (~0.3 - 0.8 seconds). This usually only happens once during a Trigger execution, and is not an issue at all in terms of performance.
Based on our internal user testing, I noticed that this error message causes confusion for a lot of users who are new to Deferrable operators. As such, I am proposing that we change the log level of that message to `INFO` so that the message is retained, but does not cause confusion. Until a method is available that would allow us to read from the database asynchronously, there is nothing that can be done about the message. 

### Use case/motivation

![image](https://github.com/apache/airflow/assets/103602455/201a41c7-ac76-4226-8d3a-7f83ccf7f146)
I'd like the user to see this message as an INFO rather than an ERROR, because there it is not something that can be addressed at the moment, and it does not cause any noticeable impact to the user.

### Related issues

_No response_

### Are you willing to submit a PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

if not HANDLER_SUPPORTS_TRIGGERER:
            return
        ctx_trigger_end.set(True)
        
        
        
        
        trigger.log.log(level=100, msg="trigger end")
    def update_triggers(self, requested_trigger_ids: set[int]):
        """
        Called from the main thread to request that we update what triggers we're running.
        Works out the differences - ones to add, and ones to remove - then
        adds them to the deques so the subthread can actually mutate the running
        trigger set.
        """
        
        
        
        
        running_trigger_ids = set(self.triggers.keys())
        known_trigger_ids = (
            running_trigger_ids.union(x[0] for x in self.events)
            .union(self.to_cancel)
            .union(x[0] for x in self.to_create)
            .union(trigger[0] for trigger in self.failed_triggers)
        )