Force astro-language-server to be the primary one for Astro (zed-indu…

…stries#19266)

Part of zed-industries#19239

Overall, this hardcoding approach has to stop and Zed better show some
notification/modal that proposes to select a primary language server,
when launching with the language that has no such settings.

Release Notes:

- Fixed Astro LSP interactions

assets/settings/default.json

@@ -824,6 +824,7 @@
  // Different settings for specific languages.
  "languages": {
  "Astro": {
+ "language_servers": ["astro-language-server", "..."],
  "prettier": {
  "allowed": true,
  "plugins": ["prettier-plugin-astro"]