ci: improve error message when payload size check fails (#41116)
ci: improve error message when payload size check fails (#41116)

Previously, when a payload size check failed, the error message prompted
the user to update the size limits using a CI-specific file path, which
was confusing (esp. for external contributors). See, for example,
https://circleci.com/gh/angular/angular/932733.

This commit improves the error message by printing the file path
relative to the repository root instead.

PR Close #41116

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