Add test parameter injector to aar list

Gradle error:

```
What went wrong:
Execution failed for task ':test-utils:generatePomFileForReleasePublication'.
> Could not apply withXml() to generated POM
   > com.google.testparameterinjector:test-parameter-injector is not on the JAR or AAR list in missing_aar_type_workaround.gradle
```

PiperOrigin-RevId: 822074776
(cherry picked from commit f7a66c9)

Author: oceanjules

missing_aar_type_workaround.gradle

@@ -60,6 +60,7 @@ def addMissingAarTypeToXml(xml) {
         "com.google.android.gms:play-services-cast-framework",
         "com.google.android.gms:play-services-cronet",
         "com.google.android.material:material",
+        "com.google.testparameterinjector:test-parameter-injector",
         "io.antmedia:rtmp-client",
         // go/keep-sorted end
     ]