chore(txnames): Remove feature flag (#52266)

See https://github.com/getsentry/getsentry/pull/11036 and
https://github.com/getsentry/relay/pull/2280.

Do not merge before those PRs have landed.

src/sentry/conf/server.py

@@ -1423,8 +1423,6 @@ SENTRY_FEATURES = {
     # NOTE: This flag does not concern transactions rewritten by clusterer rules.
     # Those are always marked as "sanitized".
     "organizations:transaction-name-mark-scrubbed-as-sanitized": True,
-    # Normalize transactions from legacy SDKs (source:unknown).
-    "organizations:transaction-name-normalize-legacy": False,
     # Sanitize transaction names in the ingestion pipeline.
     "organizations:transaction-name-sanitization": False,  # DEPRECATED
     # Extraction metrics for transactions during ingestion.

src/sentry/features/__init__.py

@@ -193,7 +193,6 @@ default_manager.add('organizations:team-project-creation-all', OrganizationFeatu
 default_manager.add('organizations:team-project-creation-all-allowlist', OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:team-roles", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
 default_manager.add("organizations:transaction-name-normalize", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
-default_manager.add("organizations:transaction-name-normalize-legacy", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
 default_manager.add("organizations:transaction-name-mark-scrubbed-as-sanitized", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
 default_manager.add("organizations:transaction-name-sanitization", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
 default_manager.add("organizations:transaction-metrics-extraction", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)

src/sentry/relay/config/__init__.py

@@ -55,7 +55,6 @@ EXPOSABLE_FEATURES = [
     "projects:span-metrics-extraction",
     "organizations:transaction-name-mark-scrubbed-as-sanitized",
     "organizations:transaction-name-normalize",
-    "organizations:transaction-name-normalize-legacy",
     "organizations:profiling",
     "organizations:session-replay",
     "organizations:session-replay-recording-scrubbing",