Add pre-release banners (#12037)

Author: cmanallen

docs/product/explore/feature-flags/index.mdx

@@ -4,7 +4,11 @@ sidebar_order: 100
 description: "Learn how to set up and interact with Sentry's feature flag evaluation tracking and feature flag change tracking."
 ---
 
-<PlatformContent includePath="feature-flags/prerelease-alert" />
+<Alert level="info" title="Currently in Beta">
+
+Feature flag change tracking and feature flag evaluation tracking is currently in open beta.
+
+</Alert>
 
 Enabling a feature flag integration provides deep insights into the state of your application prior to an error. A list of flags and their evaluation results are displayed on each error event in the order of evaluation. Integrating Sentry with your feature flag provider enables Sentry to correlate feature flag changes with new error events and mark certain changes as suspicious.
 

docs/product/issues/issue-details/index.mdx

@@ -145,6 +145,12 @@ You can set up your own context items to collect useful debugging information in
 
 ## Feature Flags
 
+<Alert level="info" title="Currently in Beta">
+
+Feature flag change tracking and feature flag evaluation tracking is currently in open beta.
+
+</Alert>
+
 Enabling one or more of our [evaluation tracking integrations](/product/explore/feature-flags/#evaluation-tracking) will reveal the feature flag evaluation table. Here you can see an ordered list (in order of evaluation) of all the flags evaluated and their evaluation results prior to the error event.
 
 ![Feature Flag Table](./img/ff-table.png)