build(telemetry): compile telemetry OUT for OTel-overhead baseline

Flip the conan default_options telemetry flag to False on this baseline
branch so a perf-iac comparison run (this branch as baseline vs the
phase-10 telemetry-on branch as on-demand) measures the full linked-in +
hot-path cost of OpenTelemetry under an identical payment workload.

The flag propagates through generate() into the CMake toolchain with no
-o override, matching perf-iac's plain `conan install` invocation
(verified: toolchain emits `set(telemetry "False")`).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

conanfile.py

@@ -54,7 +54,11 @@ class Xrpl(ConanFile):
         "rocksdb": True,
         "shared": False,
         "static": True,
-        "telemetry": True,
+        # OTel-overhead baseline branch: telemetry compiled OUT so a perf-iac
+        # comparison run (this branch as baseline vs phase-10 as on-demand)
+        # measures the full linked-in + hot-path cost of telemetry. Do not
+        # merge this flip into a feature branch.
+        "telemetry": False,
         "tests": False,
         "unity": False,
         "xrpld": False,