tests: replaced module imports to the top (OSGeo#4656)

.flake8

@@ -63,11 +63,10 @@ per-file-ignores =
     python/grass/temporal/temporal_granularity.py: E722
     # Current benchmarks/tests are changing sys.path before import.
     # Possibly, a different approach should be taken there anyway.
-    python/grass/pygrass/tests/benchmark.py: E402, F821
+    python/grass/pygrass/tests/benchmark.py: F821
     # Configuration file for Sphinx:
     # Ignoring import/code mix and line length.
     # Files not managed by Black
-    python/grass/imaging/images2gif.py: E226
     # Unused imports in init files
     # F403 star import used; unable to detect undefined names
     python/grass/temporal/__init__.py: F401, F403

python/grass/pygrass/tests/benchmark.py

@@ -15,14 +15,19 @@
 from jinja2 import Template
 from pathlib import Path
 
+
 sys.path.append(str(Path.cwd()))
 sys.path.append("%s/.." % (str(Path.cwd())))
 
+
+# flake8: noqa: E402
 import grass.lib.gis as libgis
 import grass.lib.raster as libraster
 import grass.script as gs
 import ctypes
 
+# flake8: qa
+
 
 def test__RasterSegment_value_access__if():
     test_a = pygrass.RasterSegment(name="test_a")