Make swift_module_alias not print a warning.

RELNOTES: `swift_module_alias` no longer prints a warning about possible misuse.
PiperOrigin-RevId: 253095922

swift/internal/swift_module_alias.bzl

@@ -34,23 +34,6 @@ def _swift_module_alias_impl(ctx):
     if not module_name:
         module_name = swift_common.derive_module_name(ctx.label)
 
-    # Print a warning message directing users to the new modules that they need to
-    # import. This "nag" is intended to prevent users from misusing this rule to
-    # simply forward imported modules.
-    warning = """\n
-WARNING: The Swift target \"{target}\" (defining module {module_name}) is \
-deprecated. Please update your BUILD targets and Swift code to import the \
-following dependencies instead:\n\n""".format(
-        target = str(ctx.label),
-        module_name = module_name,
-    )
-    for dep_module_name, dep_target in module_mapping.items():
-        warning += '  - "{target}" (import {module_name})\n'.format(
-            target = str(dep_target),
-            module_name = dep_module_name,
-        )
-    print(warning + "\n")
-
     # Generate a source file that imports each of the deps using `@_exported`.
     reexport_src = derived_files.reexport_modules_src(ctx.actions, ctx.label.name)
     ctx.actions.write(
@@ -170,10 +153,6 @@ after moving the physical build target as needed. (An exception to this is
 runtime type metadata, which only encodes the module name of the type where the
 symbol is defined; it is not repeated by the alias module.)
 
-This rule unconditionally prints a message directing users to migrate from the
-alias to the aliased modules---this is intended to prevent misuse of this rule
-to create "umbrella modules".
-
 > Caution: This rule uses the undocumented `@_exported` feature to re-export the
 > `deps` in the new module. You depend on undocumented features at your own
 > risk, as they may change in a future version of Swift.