Revert host-sensitive Bazel 8 platform swaps

Partially revert the recent replacement of
@bazel_tools//src/conditions:host_windows with
@platforms//os:windows.

The direct replacement is correct for js_library, which was the main
source of the Bazel 8 deprecation warning flood from generated npm
targets.

However, it changes semantics in host-sensitive helpers such as
copy_to_bin, params_file, npm_link, pkg_npm, and the vendored skylib
copy_file rule. In those places, the old condition described the
host/execution machine, while @platforms//os:windows selects on the
target platform instead. Bazel's platform/config_setting docs make that
distinction explicit. This caused regressions in packaging/publishing
flows.

Keep the js_library migration for warning reduction, and restore the
old behavior in the host-sensitive rules until they can be migrated with
a proper host-aware replacement.

Fixes regression in npm packaging/publishing after a66fc4f

Author: davido

internal/common/copy_to_bin.bzl

@@ -58,7 +58,7 @@ def copy_to_bin(name, srcs, **kwargs):
         name = name,
         srcs = srcs,
         is_windows = select({
-            "@platforms//os:windows": True,
+            "@bazel_tools//src/conditions:host_windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/common/params_file.bzl

@@ -125,7 +125,7 @@ def params_file(
         data = data,
         newline = newline or "auto",
         is_windows = select({
-            "@platforms//os:windows": True,
+            "@bazel_tools//src/conditions:host_windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/linker/npm_link.bzl

@@ -151,7 +151,7 @@ set to the target's package & the files provided from the targets DefaultInfo.
         package_name = package_name,
         package_path = package_path,
         is_windows = select({
-            "@platforms//os:windows": True,
+            "@bazel_tools//src/conditions:host_windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/pkg_npm/pkg_npm.bzl

@@ -376,15 +376,15 @@ def pkg_npm_macro(name, tgz = None, **kwargs):
     native.alias(
         name = name + ".pack",
         actual = select({
-            "@platforms//os:windows": name + ".pack.bat",
+            "@bazel_tools//src/conditions:host_windows": name + ".pack.bat",
             "//conditions:default": name + ".pack.sh",
         }),
     )
 
     native.alias(
         name = name + ".publish",
         actual = select({
-            "@platforms//os:windows": name + ".publish.bat",
+            "@bazel_tools//src/conditions:host_windows": name + ".publish.bat",
             "//conditions:default": name + ".publish.sh",
         }),
     )

third_party/github.com/bazelbuild/bazel-skylib/rules/private/copy_file_private.bzl

@@ -203,7 +203,7 @@ def copy_file(name, src, out, is_directory = False, is_executable = False, allow
         src = src,
         out = out,
         is_windows = select({
-            "@platforms//os:windows": True,
+            "@bazel_tools//src/conditions:host_windows": True,
             "//conditions:default": False,
         }),
         is_executable = is_executable,