feat(dev-infra): introduce validators for ng-dev config loading (#37049)

Introduces infrastructure to validate configuration of the ng-dev
command at run time.  Allowing for errors to be returned to the
user running the command.

PR Close #37049

dev-infra/utils/BUILD.bazel

@@ -2,10 +2,7 @@ load("@npm_bazel_typescript//:index.bzl", "ts_library")
 
 ts_library(
     name = "utils",
-    srcs = [
-        "config.ts",
-        "repo-files.ts",
-    ],
+    srcs = glob(["*.ts"]),
     module_name = "@angular/dev-infra-private/utils",
     visibility = ["//dev-infra:__subpackages__"],
     deps = [