Fix remaining releaseArtifactId renames

PiperOrigin-RevId: 404236349

extensions/media2/build.gradle

@@ -35,7 +35,7 @@ ext {
 apply from: '../../javadoc_library.gradle'
 
 ext {
-    releaseArtifact = 'extension-media2'
+    releaseArtifactId = 'extension-media2'
     releaseDescription = 'Media2 extension for ExoPlayer.'
 }
 apply from: '../../publish.gradle'

extensions/mediasession/build.gradle

@@ -26,7 +26,7 @@ ext {
 apply from: '../../javadoc_library.gradle'
 
 ext {
-    releaseArtifact = 'extension-mediasession'
+    releaseArtifactId = 'extension-mediasession'
     releaseDescription = 'Media session extension for ExoPlayer.'
 }
 apply from: '../../publish.gradle'

library/all/build.gradle

@@ -24,7 +24,7 @@ dependencies {
 }
 
 ext {
-    releaseArtifact = 'exoplayer'
+    releaseArtifactId = 'exoplayer'
     releaseDescription = 'The ExoPlayer library (all modules).'
 }
 apply from: '../../publish.gradle'