test(docs-infra): run a11y tests against `/tutorial` and update a11y scores (#41103)
test(docs-infra): run a11y tests against `/tutorial` and update a11y scores (#41103)

This commit adds `/tutorial` to the list of angular.io pages that we run
a11y tests against and updates the required scores to match the current
ones (to avoid a future regression going unnoticed).

PR Close #41103

mgechev/angular,gnomeontherun/angular,shairez/angular,ocombe/angular,gnomeontherun/angular,brandonroberts/angular,gkalpak/angular,angular-indonesia/angular,manekinekko/angular,angular/angular,alxhub/angular,manekinekko/angular,ocombe/angular,ocombe/angular,manekinekko/angular,JiaLiPassion/angular,alxhub/angular,gkalpak/angular,manekinekko/angular,mgechev/angular,angular/angular,angular-indonesia/angular,gnomeontherun/angular,JiaLiPassion/angular,brandonroberts/angular,brandonroberts/angular,JiaLiPassion/angular,mgechev/angular,gkalpak/angular,shairez/angular,brandonroberts/angular,mgechev/angular,angular/angular,manekinekko/angular,alxhub/angular,shairez/angular,mgechev/angular,brandonroberts/angular,manekinekko/angular,angular-indonesia/angular,ocombe/angular,shairez/angular,brandonroberts/angular,ocombe/angular,angular-indonesia/angular,angular/angular,gkalpak/angular,JiaLiPassion/angular,shairez/angular,alxhub/angular,ocombe/angular,alxhub/angular,gnomeontherun/angular