chore(sentryapps) Remove option for sentryapp RPC transition (#81245)

This option is no longer being read and was unset in
getsentry/sentry-options-automator#2757

Author: markstory

Diff for: src/sentry/hybridcloud/options.py

@@ -1,5 +1,5 @@
 from sentry.options import FLAG_AUTOMATOR_MODIFIABLE, register
-from sentry.utils.types import Bool, Float, Int, Sequence
+from sentry.utils.types import Bool, Int, Sequence
 
 register(
     "outbox_replication.sentry_organizationmember.replication_version",
@@ -161,10 +161,3 @@
     default=[],
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
-
-register(
-    "app_service.installations_for_org.cached",
-    type=Float,
-    default=0.0,
-    flags=FLAG_AUTOMATOR_MODIFIABLE,
-)