Add shared test cases with vim-svelte-plugin

Name cases for scenarios also in vim-svelte-plugin as shared-*, adding
one for multiline tags. test/shared.sh lists shared cases in only one
of the plugins, as a warning in a separate job on GitHub Actions.

test/cases/shared-syntax-merge.vim

@@ -0,0 +1,10 @@
+" Each key of syntax replaces the default of the same key, so template and
+" style keep html and css
+let g:vim_vue_plugin_config = {'syntax': {'script': ['javascript', 'typescript']}}
+let g:test_flatten = 1
+
+function! Check()
+  call ExpectBlock('<div>', 'template', 'html', 'htmlTemplateBlock')
+  call ExpectBlock('let count', 'script', 'typescript', 'typescriptScriptBlock')
+  call ExpectBlock('color: red', 'style', 'css', 'cssStyleBlock')
+endfunction