Don't log a warning when task queue kind is unspecified

Is your feature request related to a problem? Please describe.

The temporal server logs the following log line every time a task runs without the task queue kind set:

level=WARN msg="Unspecified task queue kind" service=frontend wf-task-queue-name=devbox-temporal-server:pay-server:shared wf-namespace=dev>

As a result, it dominates server log output. kind is well-documented to default to "Normal", so it seems odd to warn about this behavior.

The Ruby SDK we are using does not pass kind, so every Ruby task we run generates this log line. This seems like a high amount of logs for a non-issue!

Source of log line: https://github.com/temporalio/temporal/blob/5c26e48486a412d212e88a6faba14d3439627111/service/frontend/workflow_handler.go#L859

Describe the solution you'd like

Don't emit this log line by default. Maybe move it to a verbose option if it's useful for some.

Describe alternatives you've considered

We may try to patch our Ruby SDK to pass kind to silence this log line, but I believe the community would benefit from less log chunder.

Additional context
None.

Start at service/frontend/workflow_handler.go around the warning source at line 859 and inspect how an unspecified task queue kind is handled. Verify the behavior when kind is omitted and make the default path stop emitting the warning while preserving the documented Normal default.