fix(telemetry): fix CI failures in MetricsRegistry test, levelization, and dashboard titles

- Update MockServiceRegistry to match current ServiceRegistry interface
  (17 method renames: get* prefix, PathRequests→PathRequestManager)
- Make throwUnimplemented() static to satisfy clang-tidy
- Regenerate levelization ordering.txt and loops.txt
- Remove 'rippled' prefix from 3 StatsD dashboard titles

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/scripts/levelization/results/loops.txt

@@ -17,7 +17,7 @@ Loop: xrpld.app xrpld.shamap
   xrpld.shamap ~= xrpld.app
 
 Loop: xrpld.app xrpld.telemetry
-  xrpld.telemetry == xrpld.app
+  xrpld.telemetry ~= xrpld.app
 
 Loop: xrpld.overlay xrpld.rpc
   xrpld.rpc ~= xrpld.overlay

.github/scripts/levelization/results/ordering.txt

@@ -175,6 +175,8 @@ test.shamap > xrpl.basics
 test.shamap > xrpl.nodestore
 test.shamap > xrpl.protocol
 test.shamap > xrpl.shamap
+test.telemetry > xrpl.core
+test.telemetry > xrpld.telemetry
 test.toplevel > test.csf
 test.toplevel > xrpl.json
 test.unit_test > xrpl.basics
@@ -230,7 +232,6 @@ xrpld.app > xrpl.basics
 xrpld.app > xrpl.core
 xrpld.app > xrpld.consensus
 xrpld.app > xrpld.core
-xrpld.app > xrpld.telemetry
 xrpld.app > xrpl.json
 xrpld.app > xrpl.ledger
 xrpld.app > xrpl.net
@@ -289,6 +290,7 @@ xrpld.rpc > xrpl.tx
 xrpld.shamap > xrpl.shamap
 xrpld.telemetry > xrpl.basics
 xrpld.telemetry > xrpl.core
+xrpld.telemetry > xrpld.core
 xrpld.telemetry > xrpl.nodestore
 xrpld.telemetry > xrpl.protocol
 xrpld.telemetry > xrpl.rdb