refactor(core): remove no longer needed utils (#46571)
refactor(core): remove no longer needed utils (#46571)

This commit removes a file that contained utils (including `TemplateFixture`) that are no longer used.

PR Close #46571

gnomeontherun/angular,angular/angular,angular-indonesia/angular,angular-indonesia/angular,JiaLiPassion/angular,gkalpak/angular,angular-indonesia/angular,JiaLiPassion/angular,gkalpak/angular,gnomeontherun/angular,JiaLiPassion/angular,gnomeontherun/angular,angular-indonesia/angular,gkalpak/angular,angular/angular,gkalpak/angular,gnomeontherun/angular,angular/angular,angular/angular,JiaLiPassion/angular