Remove modules.apparent_repo_label_string

After removing `modules.adjust_main_repo_prefix` in the previous commit,
there's no need for `modules.apparent_repo_label_string`. In other
words, if the solution to the problem is to replace `string` inputs with
`Label`s, there's no need for a special `Label` stringifier.

docs/modules_doc.md

@@ -2,29 +2,6 @@
 
 Skylib module containing utilities for Bazel modules and module extensions.
 
-<a id="modules.apparent_repo_label_string"></a>
-
-## modules.apparent_repo_label_string
-
-<pre>
-modules.apparent_repo_label_string(<a href="#modules.apparent_repo_label_string-label">label</a>)
-</pre>
-
-Return a Label string starting with its apparent repo name.
-
-**PARAMETERS**
-
-
-| Name  | Description | Default Value |
-| :------------- | :------------- | :------------- |
-| <a id="modules.apparent_repo_label_string-label"></a>label |  a Label instance   |  none |
-
-**RETURNS**
-
-str(label) with its canonical repository name replaced with its apparent
-      repository name
-
-
 <a id="modules.apparent_repo_name"></a>
 
 ## modules.apparent_repo_name

lib/modules.bzl

@@ -147,26 +147,8 @@ def _apparent_repo_name(label_or_name):
 
     return repo_name[delimiter_indices[-1] + 1:]
 
-def _apparent_repo_label_string(label):
-    """Return a Label string starting with its apparent repo name.
-
-    Args:
-        label: a Label instance
-
-    Returns:
-        str(label) with its canonical repository name replaced with its apparent
-            repository name
-    """
-    repo_name = getattr(label, _repo_attr).lstrip("@")
-    if len(repo_name) == 0:
-        return str(label)
-
-    label_str = "@" + str(label).lstrip("@")
-    return label_str.replace(repo_name, _apparent_repo_name(label))
-
 modules = struct(
     as_extension = _as_extension,
     use_all_repos = _use_all_repos,
     apparent_repo_name = _apparent_repo_name,
-    apparent_repo_label_string = _apparent_repo_label_string,
 )

tests/modules_test.bzl

@@ -143,63 +143,13 @@ def _apparent_repo_name_test(ctx):
 
 apparent_repo_name_test = unittest.make(_apparent_repo_name_test)
 
-def _apparent_repo_label_string_test(ctx):
-    """Unit tests for modules.apparent_repo_label_string."""
-    env = unittest.begin(ctx)
-
-    main_repo = str(Label("//:all"))
-    asserts.equals(
-        env,
-        main_repo,
-        modules.apparent_repo_label_string(Label("//:all")),
-        msg = "Returns top level target with leading `@` or `@@`",
-    )
-
-    main_module_label = Label("@bazel_skylib//:all")
-    asserts.equals(
-        env,
-        main_repo,
-        modules.apparent_repo_label_string(main_module_label),
-        msg = " ".join([
-            "Returns top level target with leading `@` or `@@`",
-            "for a Label containing the main module's name",
-        ]),
-    )
-
-    rules_pkg = "@rules_pkg//:all"
-    asserts.equals(
-        env,
-        rules_pkg,
-        modules.apparent_repo_label_string(Label(rules_pkg)),
-        msg = "Returns original repo name",
-    )
-
-    asserts.equals(
-        env,
-        "@%s//:all" % (
-            "stardoc" if _is_bzlmod_enabled else "io_bazel_stardoc"
-        ),
-        modules.apparent_repo_label_string(Label("@io_bazel_stardoc//:all")),
-        msg = " ".join([
-            "Returns the actual module name instead of",
-            "repo_name from bazel_dep() (no-op under WORKSPACE).",
-        ]),
-    )
-
-    return unittest.end(env)
-
-apparent_repo_label_string_test = unittest.make(
-    _apparent_repo_label_string_test,
-)
-
 # buildifier: disable=unnamed-macro
 def modules_test_suite():
     """Creates the tests for modules.bzl if Bzlmod is enabled."""
 
     unittest.suite(
         "modules_tests",
         apparent_repo_name_test,
-        apparent_repo_label_string_test,
     )
 
     if not _is_bzlmod_enabled: