ci: check URL reachability #35593

Problem:
scripts/check_urls.vim manually matches urls in the help pages and then
synchronously checks them via curl/wget/powershell. This is extremely
slow (~5 minutes for Nvims runtime on my machine) and prone to errors in
how the urls are matched.

Solution:
- Use Tree-sitter to find the urls in the help pages and `vim.net.request` to
  check the responses.
- Add a `lintdocurls` build task and check it in CI (every Friday).
  - Reopens a dedicated issue if it finds unreachable URLs.
- Drop the old check_urls.vim script.

scripts/vim-patch.sh

@@ -208,7 +208,7 @@ preprocess_patch() {
   2>/dev/null $nvim --cmd 'set dir=/tmp' +'g@^diff --git [ab]/runtime/\<\%('"${na_rt}"'\)\>@exe "norm! d/\\v(^diff)|%$\r"' +w +q "$file"
 
   # Remove unwanted Vim doc files.
-  local na_doc='channel\.txt\|if_cscop\.txt\|netbeans\.txt\|os_\w\+\.txt\|print\.txt\|term\.txt\|testing\.txt\|todo\.txt\|vim9\.txt\|tags'
+  local na_doc='channel\.txt\|if_cscop\.txt\|netbeans\.txt\|os_\w\+\.txt\|print\.txt\|term\.txt\|testing\.txt\|todo\.txt\|vim9\.txt\|tags\|test_urls\.vim'
   2>/dev/null $nvim --cmd 'set dir=/tmp' +'g@^diff --git [ab]/runtime/doc/\<\%('"${na_doc}"'\)\>@exe "norm! d/\\v(^diff)|%$\r"' +w +q "$file"
 
   # Remove "Last change ..." changes in doc files.
@@ -327,10 +327,6 @@ preprocess_patch() {
   LC_ALL=C sed -Ee 's/( [ab]\/runtime\/doc)\/sponsor\.txt/\1\/intro.txt/g' \
     "$file" > "$file".tmp && mv "$file".tmp "$file"
 
-  # Rename test_urls.vim to check_urls.vim
-  LC_ALL=C sed -Ee 's/( [ab])\/runtime\/doc\/test(_urls\.vim)/\1\/scripts\/check\2/g' \
-    "$file" > "$file".tmp && mv "$file".tmp "$file"
-
   # Rename path to check_colors.vim
   LC_ALL=C sed -Ee 's/( [ab]\/runtime)\/colors\/(tools\/check_colors\.vim)/\1\/\2/g' \
     "$file" > "$file".tmp && mv "$file".tmp "$file"