[infra] Use python3 for all recipes.

This will ensure that new recipes that get added are run under python3.

Change-Id: I632cb6b616807aa5448083320244551ab9540b58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3421266
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@google.com>
Cr-Commit-Position: refs/heads/main@{#971936}

infra/config/recipes.star

@@ -13,7 +13,6 @@ def _recipe_for_package(cipd_package):
             name,
             cipd_version = None,
             recipe = None,
-            use_python3 = False,
             bootstrappable = False,
             experiments = None):
         """Declare a recipe for the given package.
@@ -29,7 +28,6 @@ def _recipe_for_package(cipd_package):
               information.
             cipd_version: See luci.recipe.
             recipe: See luci.recipe.
-            use_python3: See luci.recipe.
             bootstrappable: Whether or not the recipe supports the chromium
               bootstrapper. A recipe supports the bootstrapper if the following
               conditions are met:
@@ -64,7 +62,7 @@ def _recipe_for_package(cipd_package):
             cipd_version = cipd_version,
             recipe = recipe,
             use_bbagent = True,
-            use_python3 = use_python3,
+            use_python3 = True,
         )
 
         register_recipe_bootstrappability(name, bootstrappable)
@@ -81,201 +79,162 @@ build_recipe = _recipe_for_package(
 
 build_recipe(
     name = "recipe:android/androidx_packager",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:android/avd_packager",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:android/sdk_packager",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:angle_chromium",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:angle_chromium_trybot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:binary_size_generator_tot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:binary_size_trybot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:binary_size_fuchsia_trybot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:branch_configuration/tester",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:celab",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium",
     bootstrappable = True,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium/builder_config_verifier",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium/orchestrator",
     bootstrappable = True,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium/compilator",
     bootstrappable = True,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium/builder_cache_prewarmer",
     bootstrappable = True,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_3pp",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_afl",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_clang_coverage_tot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_codesearch",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_export_metadata",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_libfuzzer",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_libfuzzer_trybot",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_rts/create_model",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_trybot",
     bootstrappable = True,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:chromium_upload_clang",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:cronet",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:flakiness/generate_builder_test_data",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:findit/chromium/single_revision",
     bootstrappable = PROPERTIES_OPTIONAL,
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:presubmit",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:reclient_config_deploy_check/tester",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:reclient_goma_comparison",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:requires_testing_checker",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:swarming/deterministic_build",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:swarming/staging",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:tricium_clang_tidy_wrapper",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:tricium_metrics",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:tricium_oilpan",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:tricium_simple",
-    use_python3 = True,
 )
 
 build_recipe(
     name = "recipe:webrtc/chromium_ios",
-    use_python3 = True,
 )