[temporal] replace resource_exhausted_cause with operation

[nishkrishnan]

We've made this change in the metric already so want to make sure the dashboard is correct:
https://docs.temporal.io/production-deployment/cloud/metrics/openmetrics/metrics-reference#temporal_cloud_v1_resource_exhausted_error_count

[CLAassistant]

All committers have signed the CLA.

[Dasomeone]

@nishkrishnan if you can just sign our CLA as mentioned in the bot comment then we can get this merged in :)
Unfortunately won't be able to accept contributions without a signed contributor license agreement