Fix markdownlint fixer and add markdownlint-cli2 (#5165)

* fix(tests): fix ale_c_build_dir_names being unset in tests (#5109)

- Use ale#Set() to set the ale_c_build_dir_names variable.
- Ensure SetUpLinterTest() is called before any Save commands in tests.
- Add c.vim to runtime before non-linter tests are executed.
- Remove workarounds in c.vim.

* feat: Load Prettier from cjs also

* fix: wrong command for markdownlint

* feat: explicit support for markdownlint-cli2

- Add markdownlint-cli2 linter and fixer, separate from markdownilnt-cli
- Rename markdownlint to markdownlint-cli
- Keep markdownlint as alias for markdownlint-cli

---------

Co-authored-by: w0rp <devw0rp@gmail.com>
Co-authored-by: Horacio Sanson <horacio.sanson@dena.jp>

test/fixers/test_markdownlint_cli2_fixer_callback.vader

@@ -0,0 +1,28 @@
+Before:
+  call ale#assert#SetUpFixerTest('markdown', 'markdownlint-cli2')
+
+After:
+  call ale#assert#TearDownFixerTest()
+
+Execute(The default command should use a temporary file):
+  AssertFixer {
+  \ 'command': ale#Escape('markdownlint-cli2') . ' --fix %t',
+  \ 'read_temporary_file': 1,
+  \}
+
+Execute(The executable should be configurable):
+  let g:ale_markdownlint_cli2_executable = 'custom_markdownlint_cli2'
+
+  AssertFixer {
+  \ 'command': ale#Escape('custom_markdownlint_cli2') . ' --fix %t',
+  \ 'read_temporary_file': 1,
+  \}
+
+Execute(Custom options should not remove the required --fix option):
+  let g:ale_markdownlint_cli2_executable = 'markdownlint-cli2'
+  let g:ale_markdownlint_cli2_options = '--no-globs'
+
+  AssertFixer {
+  \ 'command': ale#Escape('markdownlint-cli2') . ' --fix --no-globs %t',
+  \ 'read_temporary_file': 1,
+  \}

test/fixers/test_markdownlint_fixer_callback.vader

@@ -4,14 +4,25 @@ Before:
 After:
   call ale#assert#TearDownFixerTest()
 
-Execute:
+Execute(The default command should use a temporary file):
   AssertFixer {
-  \ 'command': ale#Escape('markdownlint') . ' --fix',
+  \ 'command': ale#Escape('markdownlint') . ' --fix %t',
+  \ 'read_temporary_file': 1,
   \}
 
-Execute:
+Execute(The executable should be configurable):
   let g:ale_markdownlint_executable = 'custom_markdownlint'
-  
+
   AssertFixer {
-  \ 'command': ale#Escape('custom_markdownlint') . ' --fix',
+  \ 'command': ale#Escape('custom_markdownlint') . ' --fix %t',
+  \ 'read_temporary_file': 1,
+  \}
+
+Execute(Custom options should not remove the required --fix option):
+  let g:ale_markdownlint_executable = 'markdownlint'
+  let g:ale_markdownlint_options = '--quiet'
+
+  AssertFixer {
+  \ 'command': ale#Escape('markdownlint') . ' --fix --quiet %t',
+  \ 'read_temporary_file': 1,
   \}