Remove restriction on generate_pdb_file to be only used in dbg and fa…

…stbuild mode

Users may want to build in opt mode and still want the pdb file to be a linking action output.
See bazelbuild/rules_cc#94 (comment)

RELNOTES: None
PiperOrigin-RevId: 372351216

tools/cpp/windows_cc_toolchain_config.bzl

@@ -666,10 +666,6 @@ def _impl(ctx):
 
         generate_pdb_file_feature = feature(
             name = "generate_pdb_file",
-            requires = [
-                feature_set(features = ["dbg"]),
-                feature_set(features = ["fastbuild"]),
-            ],
         )
 
         output_execpath_flags_feature = feature(