Clean up tests: xfail git windows and ugly jinja2 test

[bkreider]

In my PR, i xfail this test otherwise it hard fails. See: https://github.com/anaconda/anaconda-linter/pull/369/files#diff-dab905a3625ce6df77f61b134d2b2e61bc0d09609bf902c2a5092f45730f8280

See the commentary for the test here: https://github.com/anaconda/anaconda-linter/pull/369/files#diff-11b4c502df02b23a6f1ff6164b6f6145f03cb413b2beef3dd6a5c1c11653bc23

Code:

anaconda-linter/tests/test_lint.py

Lines 206 to 224 in 92bcb92

	# TODO figure out: 1 test fails if we remove this retry mechanism. Can we write the test differently so that
	# we don't have conditional logic in our tests?
	if not jinja_func == "pin_subpackage('dotnet-runtime', exact=True, badParam=False)":
	print(jinja_func)
	recipe = Recipe.from_string(
	recipe_text=yaml_str, renderer=RendererType.RUAMEL, variant={"target_platform": "dummy-platform"}
	)
	linter.lint([recipe])
	messages = linter.get_messages()
	return messages
	# Only this test needs the weird exception handling
	try:
	recipe = Recipe.from_string(recipe_text=yaml_str, renderer=RendererType.RUAMEL)
	except RecipeError as exc:
	recipe = Recipe("")
	check_cls = lint.recipe_error_to_lint_check.get(exc.__class__, lint.linter_failure)
	messages = [check_cls.make_message(recipe=recipe, line=getattr(exc, "line"))]
	return messages

        # TODO figure out: 1 test fails if we remove this retry mechanism. Can we write the test differently so that
        # we don't have conditional logic in our tests?
        if not jinja_func == "pin_subpackage('dotnet-runtime', exact=True, badParam=False)":
            print(jinja_func)
            recipe = Recipe.from_string(
                recipe_text=yaml_str, renderer=RendererType.RUAMEL, variant={"target_platform": "dummy-platform"}
            )
            linter.lint([recipe])
            messages = linter.get_messages()
            return messages

        # Only this test needs the weird exception handling
        try:
            recipe = Recipe.from_string(recipe_text=yaml_str, renderer=RendererType.RUAMEL)
        except RecipeError as exc:
            recipe = Recipe("")
            check_cls = lint.recipe_error_to_lint_check.get(exc.__class__, lint.linter_failure)
            messages = [check_cls.make_message(recipe=recipe, line=getattr(exc, "line"))]
            return messages