chore: Migrate python-dataproc synth.py from artman to bazel (#18)

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

synth.py

@@ -19,15 +19,20 @@
 import synthtool as s
 from synthtool import gcp
 
-gapic = gcp.GAPICGenerator()
+gapic = gcp.GAPICBazel()
 common = gcp.CommonTemplates()
 versions = ["v1beta2", "v1"]
 
 # ----------------------------------------------------------------------------
 # Generate dataproc GAPIC layer
 # ----------------------------------------------------------------------------
 for version in versions:
-    library = gapic.py_library("dataproc", version, include_protos=True,)
+    library = gapic.py_library(
+        service="dataproc",
+        version=version,
+        bazel_target=f"//google/cloud/dataproc/{version}:dataproc-{version}-py",
+        include_protos=True,
+    )
     s.move(library, excludes=["docs/index.rst", "nox.py", "README.rst", "setup.py"])
 
     s.replace(