Fix BT integration tests mark ii (#5608)

Author: kellen

integration/src/test/scala/com/spotify/scio/bigtable/BigtableIT.scala

@@ -41,11 +41,7 @@ object BigtableIT {
   def testData(id: String): Seq[(String, Long)] =
     Seq((s"$id-key1", 1L), (s"$id-key2", 2L), (s"$id-key3", 3L))
 
-  val bigtableOptions: BigtableOptions = BigtableOptions
-    .builder()
-    .setProjectId(projectId)
-    .setInstanceId(instanceId)
-    .build
+  val bigtableOptions: BigtableOptions = BTOptions(projectId, instanceId)
 
   val FAMILY_NAME: String = "count"
   val COLUMN_QUALIFIER: ByteString = ByteString.copyFromUtf8("long")

scio-google-cloud-platform/src/main/scala/com/spotify/scio/bigtable/BTOptions.scala

@@ -0,0 +1,8 @@
+package com.spotify.scio.bigtable
+
+import com.google.cloud.bigtable.config.BigtableOptions
+
+object BTOptions {
+  def apply(projectId: String, instanceId: String): BigtableOptions =
+    BigtableOptions.builder().setProjectId(projectId).setInstanceId(instanceId).build
+}