analyze: implement mechanism to ignore some file changes

scripts/slave/recipes/chromium_trybot.expected/full_tryserver_chromium_android_android_coverage.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.chromium.android",
       "--builder",
       "android_coverage",
@@ skipping 237 matching lines @@
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "import sys; sys.exit(0)"
     ],
     "name": "analyze",
     "~followup_annotations": [
+      "@@@STEP_TEXT@Analyze disabled: matched exclusion@@@",
       "@@@STEP_LOG_LINE@excluded_files@foo.cc (regex = 'f.*')@@@",
       "@@@STEP_LOG_END@excluded_files@@@",
       "@@@STEP_LOG_LINE@analyze_details@{@@@",
       "@@@STEP_LOG_LINE@analyze_details@  \"additional_compile_targets\": [], @@@",
       "@@@STEP_LOG_LINE@analyze_details@  \"compile_targets\": [@@@",
       "@@@STEP_LOG_LINE@analyze_details@    \"android_webview_test_apk\", @@@",
       "@@@STEP_LOG_LINE@analyze_details@    \"chrome_public_test_apk\", @@@",
       "@@@STEP_LOG_LINE@analyze_details@    \"chrome_sync_shell_test_apk\", @@@",
       "@@@STEP_LOG_LINE@analyze_details@    \"content_shell_test_apk\"@@@",
       "@@@STEP_LOG_LINE@analyze_details@  ], @@@",
@@ skipping 1181 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]