Consolidate flags for displaying metadata

Metadata is now always shown - update code and test data to reflect this.

Bug: 228381885
Test: presubmit
Change-Id: I4fb096c4b0b8dffc488466a53c364b07ffbdff99
diff --git a/testData/compose/docs/reference/androidx/compose/animation/ExperimentalAnimationApi.html b/testData/compose/docs/reference/androidx/compose/animation/ExperimentalAnimationApi.html
index 7b32bdc..a8d4e59 100644
--- a/testData/compose/docs/reference/androidx/compose/animation/ExperimentalAnimationApi.html
+++ b/testData/compose/docs/reference/androidx/compose/animation/ExperimentalAnimationApi.html
@@ -5,6 +5,7 @@
 {% include "_shared/_reference-head-tags.html" %}
   </head>
   <body>
+    <div id="metadata-info-block"></div>
     <h1>ExperimentalAnimationApi</h1>
     <p>
       <pre>@<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-requires-opt-in/index.html">RequiresOptIn</a>(message&nbsp;=&nbsp;&quot;This is an experimental animation API.&quot;)<br>@<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.annotation/-target/index.html">Target</a>(allowedTargets&nbsp;=&nbsp;[AnnotationTarget.CLASS,&nbsp;AnnotationTarget.FUNCTION,&nbsp;AnnotationTarget.PROPERTY])<br>public annotation <a href="/reference/androidx/compose/animation/ExperimentalAnimationApi.html">ExperimentalAnimationApi</a></pre>