chore(hybrid-cloud): Clean up unused rollout option (#97562)

After getsentry/sentry-options-automator#4871 is
merged and deployed, we can finalize the clean up of this option.

Author: vgrozdanic

src/sentry/options/defaults.py

@@ -3431,13 +3431,6 @@
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
 
-register(
-    "sentry.hybridcloud.cacheversion.rollout",
-    type=Float,
-    default=0.0,
-    flags=FLAG_AUTOMATOR_MODIFIABLE,
-)
-
 # Enable enhancing access logs with snuba responses
 register("issues.use-snuba-error-data", type=Float, default=0.0, flags=FLAG_AUTOMATOR_MODIFIABLE)