Revert "chore: Update GAX dependency scope to provided. (#1924)"

This reverts commit 95671a4.

Author: ttosta-google

core/pom.xml

@@ -132,12 +132,11 @@
     </dependency>
     <!-- GAX provides native-image metadata for core Google libraries, such as
       Google API Client and Google HTTP Client. Users' GraalVM native image
-      compilation needs the metadata. The provided-scope dependencies do not add
-      additional dependencies to library users. -->
+      compilation needs the metadata. Therefore, this is not part of a profile
+      or provided-scope. -->
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax</artifactId>
-      <scope>provided</scope>
       <exclusions>
         <!-- Native image users only need GAX's native-image metadata. GAX's
         dependencies are unnecessary for normal users and native image users -->