docs: release notes for the v12.1.5 release (#43046)
docs: release notes for the v12.1.5 release (#43046)


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