Add support for Bazel 7 and 8 in Bazel CI (#8505)

* Add missing file to filegroup for bazel integration tests

Fixup after a9257b6963.

* Align versions in bazel_respository_test_dir with root

* Update XCode version to 15.2

This is the oldest available version.

* Add WORKSPACE.bzlmod

* Add support for Bazel 7

* Add support for Bazel 8 in CI

ts/BUILD.bazel

@@ -7,6 +7,7 @@ filegroup(
     srcs = [
         "BUILD.bazel",
         "compile_flat_file.sh",
+        "pnpm-lock.yaml",
         "repositories.bzl",
     ] + glob([
         "*.ts",