fix(bigtable): allow bulkTests profile to skip unit tests by removing explicit skipTests override

Author: lqiu96

java-bigtable/google-cloud-bigtable/pom.xml

@@ -21,7 +21,6 @@
 
     <!-- Enable the ability to skip unit tests and only run integration tests,
          while still respecting global skipTests override. -->
-    <skipTests>false</skipTests>
     <skipUnitTests>${skipTests}</skipUnitTests>
     <skipITs>${skipTests}</skipITs>
     <!-- Configure test logging output. By default tests print info logs to stdout/err.