build: sanitize non-alpha characters in builder cache path

scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Kitchen__kitchen_run_.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.fyi",
       "--builder",
       "Linux Kitchen (kitchen_run)",
@@ skipping 240 matching lines @@
       "[SLAVE_BUILD]/src/tools/mb/mb.py",
       "gen",
       "-m",
       "chromium.fyi",
       "-b",
       "Linux Kitchen (kitchen_run)",
       "--config-file",
       "[SLAVE_BUILD]/src/tools/mb/mb_config.pyl",
       "--goma-dir",
       "[CACHE]/cipd/goma",
-      "[SLAVE_BUILD]/src/out/Linux Kitchen (kitchen_run)/Release"
+      "[SLAVE_BUILD]/src/out/Linux_Kitchen__kitchen_run_/Release"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 15 matching lines @@
       "ninja",
       "--build-data-dir",
       "[ROOT]/build_data_dir",
       "--compiler",
       "goma",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-service-account-json-file",
       "/creds/service_accounts/service-account-goma-client.json",
       "--target-output-dir",
-      "[SLAVE_BUILD]/src/out/Linux Kitchen (kitchen_run)/Release",
+      "[SLAVE_BUILD]/src/out/Linux_Kitchen__kitchen_run_/Release",
       "--goma-dir",
       "[CACHE]/cipd/goma",
       "--ninja-ensure-up-to-date",
       "--",
       "all"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
       "@@@STEP_LOG_END@json.output (invalid)@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]