feat(relay): Add option to drop transaction attachments (#84069)

Register the new option and forward it to Relay.

Author: jjbayer

src/sentry/options/defaults.py

@@ -530,6 +530,14 @@
     flags=FLAG_ALLOW_EMPTY | FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+# Drop attachments in transaction envelopes in Relay.
+register(
+    "relay.drop-transaction-attachments",
+    type=Bool,
+    default=False,
+    flags=FLAG_ALLOW_EMPTY | FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 # Analytics
 register("analytics.backend", default="noop", flags=FLAG_NOSTORE)
 register("analytics.options", default={}, flags=FLAG_NOSTORE)

src/sentry/relay/globalconfig.py

@@ -23,6 +23,7 @@
     "relay.metric-stats.rollout-rate",
     "relay.span-extraction.sample-rate",
     "relay.span-normalization.allowed_hosts",
+    "relay.drop-transaction-attachments",
 ]