Revert "DO NOT MERGE: temporary check of streaming query threshold"

This reverts commit c275372.

python/lsst/daf/butler/remote_butler/server/handlers/_query_streaming.py

@@ -51,7 +51,7 @@
 # an HTTP 503 Service Unavailable with a Retry-After header.  We are currently
 # using the default FastAPI thread pool size of 40 (total) and have 40 maximum
 # database connections (per Butler repository.)
-_MAXIMUM_CONCURRENT_STREAMING_QUERIES = 5
+_MAXIMUM_CONCURRENT_STREAMING_QUERIES = 25
 # How long we ask callers to wait before trying their query again.
 # The hope is that they will bounce to a less busy replica, so we don't want
 # them to wait too long.