JavaScript: Add runnable tests (#12118)

https://github.com/zed-industries/zed/assets/62463826/2912c940-bd00-483d-9ce7-df1a2539560a


Release Notes:

- Added runnable tests for JavaScript & Typescript files.
- Added task to run selected javascript code.

crates/languages/src/javascript/outline.scm

@@ -60,3 +60,14 @@
         (accessibility_modifier)
     ]* @context
     name: (_) @name) @item
+
+; Add support for (node:test, bun:test and Jest) runnable
+(call_expression
+    function: (_) @context
+    (#any-of? @context "it" "test" "describe")
+    arguments: (
+        arguments . (string
+            (string_fragment) @name
+        )
+    )
+) @item