chore: update synth.py to latest noxfile template (#93)

Follow-up to #86 where I manually reverted a change to `noxfile.py`

noxfile.py

@@ -75,8 +75,6 @@ def default(session):
     session.install(
         "mock", "pytest", "pytest-cov",
     )
-    session.install("-e", ".")
-
     session.install("-e", ".[fastavro,pandas,pyarrow]")
 
     # Run py.test against the unit tests.

synth.py

@@ -74,7 +74,8 @@
 templated_files = common.py_library(
     microgenerator=True,
     samples=True,
-    unit_test_dependencies=optional_deps,
+    unit_test_local_dependencies=optional_deps,
+    system_test_local_dependencies=optional_deps,
     cov_level=95,
 )
 s.move(
@@ -201,19 +202,8 @@
 # redundant to install the library twice.
 s.replace(
     "noxfile.py",
-    (
-        r'session\.install\("-e", "\."\)\n    '
-        r'(?=session\.install\("-e", "\.\[fastavro)'  # in unit tests session
-    ),
-    "",
-)
-s.replace(
-    "noxfile.py",
-    (
-        r'(?<=google-cloud-testutils", \)\n)'
-        r'    session\.install\("-e", "\."\)\n'  # in system tests session
-    ),
-    '    session.install("-e", ".[fastavro,pandas,pyarrow]")\n',
+    r'\)\s*session\.install\("-e", "\."\)\n',
+    ")\n",
 )
 
 # Fix test coverage plugin paths.