Make bzlmod repo rules compatible with Bazel 8 (google#1083)

There is an upcoming behavior change in bzlmod

  --incompatible_use_plus_in_repo_names,

which changes the separator character in canonical repo names from
tilde `~` to plus `+` due to I/O performance issue in Windows.

 * bazelbuild/bazel#23127

The above flag is planned to be enabled by default in Bazel 8.0, which
is expected to be released on November 2024. Let's update our custom
repository rules so that they can continue working with Bazel 8.0.

PiperOrigin-RevId: 686421798

src/bazel/dotnet_tool_repository.bzl

@@ -50,7 +50,9 @@ def _dotnet_tool_repo_impl(repo_ctx):
     tool_name = repo_ctx.attr.tool_name
     if not tool_name:
         # In bzlmod, repo_ctx.attr.name has a prefix like "_main~_repo_rules~wix".
-        tool_name = repo_ctx.attr.name.split("~")[-1]
+        # Note also that Bazel 8.0+ uses "+" instead of "~".
+        # https://github.com/bazelbuild/bazel/issues/23127
+        tool_name = repo_ctx.attr.name.replace("~", "+").split("+")[-1]
     version = repo_ctx.attr.version
 
     repo_ctx.execute([

src/bazel/pkg_config_repository.bzl

@@ -105,7 +105,9 @@ def _pkg_config_repository_impl(repo_ctx):
     _symlinks(repo_ctx, includes)
     data = {
         # In bzlmod, repo_ctx.attr.name has a prefix like "_main~_repo_rules~ibus".
-        "name": repo_ctx.attr.name.split("~")[-1],
+        # Note also that Bazel 8.0+ uses "+" instead of "~".
+        # https://github.com/bazelbuild/bazel/issues/23127
+        "name": repo_ctx.attr.name.replace("~", "+").split("+")[-1],
         "hdrs": _make_strlist([item + "/**" for item in includes]),
         "copts": _make_strlist(_exec_pkg_config(repo_ctx, "--cflags-only-other")),
         "includes": _make_strlist(includes),