Migrating web_analysis from Cirrus to LUCI (PART 1) (#19726)
Migrating web_analysis from Cirrus to LUCI (PART 1) (#19726)

* adding a script for web_analysis for using from luci.

* addressing reviewer comments
flutter/engine,jason-simmons/flutter_engine,aam/engine,jamesr/sky_engine,rmacnak-google/engine,devoncarew/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,Hixie/sky_engine,flutter/engine,tvolkert/engine,jason-simmons/sky_engine,tvolkert/engine,flutter/engine,jason-simmons/sky_engine,Hixie/sky_engine,Hixie/sky_engine,devoncarew/sky_engine,Hixie/sky_engine,tvolkert/engine,chinmaygarde/flutter_engine,chinmaygarde/sky_engine,aam/engine,Hixie/sky_engine,tvolkert/engine,tvolkert/engine,jamesr/sky_engine,tvolkert/engine,chinmaygarde/sky_engine,devoncarew/sky_engine,jamesr/flutter_engine,jamesr/sky_engine,jason-simmons/flutter_engine,devoncarew/engine,jason-simmons/sky_engine,aam/engine,tvolkert/engine,devoncarew/engine,devoncarew/engine,flutter/engine,chinmaygarde/sky_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,jamesr/sky_engine,jamesr/sky_engine,Hixie/sky_engine,chinmaygarde/flutter_engine,rmacnak-google/engine,devoncarew/sky_engine,chinmaygarde/sky_engine,flutter/engine,aam/engine,chinmaygarde/flutter_engine,rmacnak-google/engine,devoncarew/engine,jamesr/flutter_engine,rmacnak-google/engine,jamesr/flutter_engine,Hixie/sky_engine,chinmaygarde/sky_engine,jason-simmons/sky_engine,jamesr/flutter_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,flutter/engine,aam/engine,jason-simmons/flutter_engine,jamesr/sky_engine,jason-simmons/sky_engine,chinmaygarde/flutter_engine,devoncarew/engine,jason-simmons/flutter_engine,devoncarew/engine,jamesr/flutter_engine,jamesr/flutter_engine,chinmaygarde/sky_engine,aam/engine,chinmaygarde/sky_engine,devoncarew/sky_engine,chinmaygarde/flutter_engine,devoncarew/sky_engine,Hixie/sky_engine,rmacnak-google/engine,rmacnak-google/engine,jason-simmons/flutter_engine,flutter/engine,jamesr/sky_engine,jamesr/flutter_engine,devoncarew/sky_engine,jason-simmons/flutter_engine,devoncarew/sky_engine,jamesr/flutter_engine,flutter/engine,aam/engine,aam/engine