Use a custom scheme & the worker name for replication requests. (#15578)

All the information needed is already in the `instance_map`, so
use that instead of passing the hostname / IP & port manually
for each replication request.

This consolidates logic for future improvements of using e.g.
UNIX sockets for workers.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/15578.misc b/changelog.d/15578.misc
new file mode 100644
index 0000000000..a54422239b
--- /dev/null
+++ b/changelog.d/15578.misc
@@ -0,0 +1 @@
+Allow connecting to HTTP Replication Endpoints by using `worker_name` when constructing the request.