chore: rename the dev-only setup files to more clearly self-describe what they are (#2436)

The names `internal_deps` and `internal_setup` are a bit confusing and
ambiguous: are they
for setting up something internal so that rules_python works, or
something else?

Clarify by putting `dev` in their names. This helps match the naming
used for bzlmod
(python/private/internal_dev_deps.bzl).

BUILD.bazel

diff --git a/BUILD.bazel b/BUILD.bazel
index 5a58422..5e85c27 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -40,8 +40,8 @@
         "MODULE.bazel",
         "WORKSPACE",
         "WORKSPACE.bzlmod",
-        "internal_deps.bzl",
-        "internal_setup.bzl",
+        "internal_dev_deps.bzl",
+        "internal_dev_setup.bzl",
         "version.bzl",
         "//python:distribution",
         "//tools:distribution",

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 46ebbc8..f03cc26 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -17,7 +17,7 @@
 # Everything below this line is used only for developing rules_python. Users
 # should not copy it to their WORKSPACE.
 
-load("//:internal_deps.bzl", "rules_python_internal_deps")
+load("//:internal_dev_deps.bzl", "rules_python_internal_deps")
 
 rules_python_internal_deps()
 
@@ -37,7 +37,7 @@
 
 stardoc_pinned_maven_install()
 
-load("//:internal_setup.bzl", "rules_python_internal_setup")
+load("//:internal_dev_setup.bzl", "rules_python_internal_setup")
 
 rules_python_internal_setup()
 

internal_dev_deps.bzl

diff --git a/internal_deps.bzl b/internal_dev_deps.bzl
similarity index 96%
rename from internal_deps.bzl
rename to internal_dev_deps.bzl
index f7c363c..8019681 100644
--- a/internal_deps.bzl
+++ b/internal_dev_deps.bzl
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Dependencies that are needed for rules_python tests and tools."""
+"""Dependencies that are needed for development and testing of rules_python itself."""
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", _http_archive = "http_archive", _http_file = "http_file")
 load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
@@ -32,7 +32,13 @@
     )
 
 def rules_python_internal_deps():
-    """Fetches all required dependencies for rules_python tests and tools."""
+    """Fetches all required dependencies for developing/testing rules_python itself.
+
+    Setup of these dependencies is done by `internal_dev_setup.bzl`
+
+    For dependencies needed by *users* of rules_python, see
+    python/private/py_repositories.bzl.
+    """
 
     http_archive(
         name = "bazel_skylib",

internal_dev_setup.bzl

diff --git a/internal_setup.bzl b/internal_dev_setup.bzl
similarity index 94%
rename from internal_setup.bzl
rename to internal_dev_setup.bzl
index 03b3c02..554ff92 100644
--- a/internal_setup.bzl
+++ b/internal_dev_setup.bzl
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Setup for rules_python tests and tools."""
+"""WORKSPACE setup for development and testing of rules_python itself."""
 
 load("@bazel_features//:deps.bzl", "bazel_features_deps")
 load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
@@ -30,7 +30,7 @@
 load("//python/private/pypi:deps.bzl", "pypi_deps")  # buildifier: disable=bzl-visibility
 
 def rules_python_internal_setup():
-    """Setup for rules_python tests and tools."""
+    """Setup for development and testing of rules_python itself."""
 
     internal_config_repo(name = "rules_python_internal")
     hub_repo(