vim-patch:9.1.1468: filetype: bright(er)script files are not recognized

Problem:  filetype: bright(er)script files are not recognized
Solution: detect *.bs files as brighterscript filetype and *.brs as
          brightscript filetype, include filetype plugins (Riley Bruins)

closes: vim/vim#17566

https://github.com/vim/vim/commit/03e5ee25fdd4f8ee16b00688e24c4ad3b8f8f935

Co-authored-by: Riley Bruins <ribru17@hotmail.com>

runtime/ftplugin/brighterscript.vim

@@ -0,0 +1,11 @@
+" Vim filetype plugin
+" Language:	Brighterscript
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2025 Jun 17
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+runtime! ftplugin/brightscript.vim

runtime/ftplugin/brightscript.vim

@@ -0,0 +1,13 @@
+" Vim filetype plugin
+" Language:	Brightscript
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2025 Jun 17
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=:' commentstring='\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'

runtime/lua/vim/filetype.lua

@@ -258,6 +258,8 @@ local extension = {
   bl = 'blank',
   blp = 'blueprint',
   bp = 'bp',
+  bs = 'brighterscript',
+  brs = 'brightscript',
   bsd = 'bsdl',
   bsdl = 'bsdl',
   bst = 'bst',

test/old/testdir/test_filetype.vim

@@ -142,6 +142,8 @@ func s:GetFilenameChecks() abort
     \ 'blank': ['file.bl'],
     \ 'blueprint': ['file.blp'],
     \ 'bp': ['Android.bp'],
+    \ 'brighterscript': ['file.bs'],
+    \ 'brightscript': ['file.brs'],
     \ 'bsdl': ['file.bsd', 'file.bsdl'],
     \ 'bst': ['file.bst'],
     \ 'bzl': ['file.bazel', 'file.bzl', 'WORKSPACE', 'WORKSPACE.bzlmod'],