Temporarily disable passing worker labels to flow run

[jakekaplan]

This PR temporarily removes _give_worker_labels_to_flow_run from the worker's submission loop.

This method uses the CloudClient.update_flow_run_labels. The CloudClient does not have all the special httpx_settings and custom transport setup that we instantiate in the constructor of PrefectClient. This can potentially lead to instability and can lead to httpx.ConnectTimeout errors (and others) when the CloudClient is used in something like the Worker that will need to make a lot of requests. Previously the CloudClient was only for things like 1 of CLI commands.

The _give_worker_labels_to_flow_run method can be added back to the worker's submission loop when update_flow_run_labels is moved over to PrefectClient (which is blocked by https://github.com/PrefectHQ/prefect/pull/16233/files, but to my understanding is going to happen soon). For now it is non critical to have this in place and will hopefully lead to less errors during flow run submission.

Long term we might need consolidate creating our httpx_settings if the CloudClient is going to be used in higher request volume scenarios like orchestration (happy to do this in another pr, but didn't want to jump the gun as it seems the method is going to be moved over to the other client already).

[codspeed-hq]

CodSpeed Performance Report

Merging #16339 will not alter performance

_{Comparing remove-ensure-labels (9ad3292) with main (686d4c3)}

Summary

✅ 3 untouched benchmarks

[zzstoatzz]

lgtm!