fix(proj-config): Set correct `noCache` param (#35503)

Relay renames options to camel case, so `no_cache` never exists and the
correct option name is `noCache`. See
https://github.com/getsentry/relay/blob/66028fb8368f3941a68eac0d2f4421994490b85e/relay-server/src/actors/project_upstream.rs#L43-L49

src/sentry/api/endpoints/relay/project_configs.py

@@ -49,7 +49,7 @@ class RelayProjectConfigsEndpoint(Endpoint):
         version = request.GET.get("version") or "1"
         set_tag("relay_protocol_version", version)
 
-        no_cache = request.relay_request_data.get("no_cache") or False
+        no_cache = request.relay_request_data.get("noCache") or False
         set_tag("relay_no_cache", no_cache)
 
         enable_v3 = random.random() < options.get("relay.project-config-v3-enable")