Remove lookbehind in grammar and add inner TS/JS source patterns

Using a positive lookbehind can subtly break Textmate/VSCode’s syntax
highlighting. The positive lookbehind (according to some online sources)
can fail unexpectedly when they contain whitespace matches.

This means that we should instead match explicitly, like the other
patterns do. This means however, that we might match too much and
I noticed that arguments to the function aren't highlighted correctly.

According to the interpolation rule in `graphql.json` we now include
patterns for JS/TS/etc as a fallback pattern.

This fixes the issue and prevents the case where the rule was
conflicting with normal JS/TS patterns in a different tmLanguage
grammar.

packages/vscode-graphql-syntax/grammars/graphql.js.json

@@ -3,11 +3,22 @@
   "injectionSelector": "L:(meta.embedded.block.javascript | meta.embedded.block.typescript | source.js | source.ts | source.tsx | source.vue | source.svelte | source.astro) -source.graphql -inline.graphql -string -comment",
   "patterns": [
     {
-      "contentName": "meta.embedded.block.graphql",
-      "begin": "(?<=(?:(?:Relay\\??\\.)QL|gql|graphql|graphql\\.experimental)\\s*(?:<.*>)?\\s*)\\(",
+      "begin": "\\s*+(?:(Relay)\\??\\.)(QL)|(gql|graphql|graphql\\.experimental)\\s*(?:<.*>)?\\s*\\(",
       "end": "\\)",
+      "beginCaptures": {
+        "1": {
+          "name": "variable.other.class.js"
+        },
+        "2": {
+          "name": "entity.name.function.tagged-template.js"
+        },
+        "3": {
+          "name": "entity.name.function.tagged-template.js"
+        }
+      },
       "patterns": [
         {
+          "contentName": "meta.embedded.block.graphql",
           "begin": "(`|')",
           "end": "(`|')",
           "beginCaptures": {
@@ -25,6 +36,14 @@
               "include": "source.graphql"
             }
           ]
+        },
+        {
+          "patterns": [
+            { "include": "source.js" },
+            { "include": "source.ts" },
+            { "include": "source.js.jsx" },
+            { "include": "source.tsx" }
+          ]
         }
       ]
     },