Use standard injection.language and injection.content captures (#22268)

Closes #9656. Continuation of #9654, but with the addition of backwards
compatibility for the existing captures.

Release Notes:

- Improved Tree-sitter support with added compatibility for standard
injections captures

---------

Co-authored-by: Finn Evers <finn.evers@outlook.de>

extensions/elixir/languages/elixir/injections.scm

@@ -2,6 +2,6 @@
 
 ((sigil
   (sigil_name) @_sigil_name
-  (quoted_content) @content)
+  (quoted_content) @injection.content)
  (#eq? @_sigil_name "H")
- (#set! language "heex"))
+ (#set! injection.language "heex"))

extensions/elixir/languages/heex/injections.scm

@@ -4,10 +4,10 @@
       (partial_expression_value)
       (expression_value)
       (ending_expression_value)
-    ] @content)
-  (#set! language "elixir")
-  (#set! combined)
+    ] @injection.content)
+  (#set! injection.language "elixir")
+  (#set! injection.combined)
 )
 
-((expression (expression_value) @content)
- (#set! language "elixir"))
+((expression (expression_value) @injection.content)
+ (#set! injection.language "elixir"))

extensions/html/languages/html/injections.scm

@@ -1,7 +1,7 @@
 (script_element
-  (raw_text) @content
-  (#set! "language" "javascript"))
+  (raw_text) @injection.content
+  (#set! injection.language "javascript"))
 
 (style_element
-  (raw_text) @content
-  (#set! "language" "css"))
+  (raw_text) @injection.content
+  (#set! injection.language "css"))

extensions/php/languages/php/injections.scm

@@ -1,9 +1,9 @@
-((text) @content
- (#set! "language" "html")
- (#set! "combined"))
+((text) @injection.content
+ (#set! injection.language "html")
+ (#set! injection.combined))
 
-((comment) @content
-  (#match? @content "^/\\*\\*[^*]")
-  (#set! "language" "phpdoc"))
+((comment) @injection.content
+  (#match? @injection.content "^/\\*\\*[^*]")
+  (#set! injection.language "phpdoc"))
 
-((heredoc_body) (heredoc_end) @language) @content
+((heredoc_body) (heredoc_end) @injection.language) @injection.content

extensions/terraform/languages/hcl/injections.scm

@@ -1,6 +1,6 @@
 ; https://github.com/nvim-treesitter/nvim-treesitter/blob/ce4adf11cfe36fc5b0e5bcdce0c7c6e8fbc9798a/queries/hcl/injections.scm
 
 (heredoc_template
-  (template_literal) @content
-  (heredoc_identifier) @language
-  (#downcase! @language))
+  (template_literal) @injection.content
+  (heredoc_identifier) @injection.language
+  (#downcase! @injection.language))

extensions/terraform/languages/terraform-vars/injections.scm

@@ -1,9 +1,9 @@
 ; https://github.com/nvim-treesitter/nvim-treesitter/blob/ce4adf11cfe36fc5b0e5bcdce0c7c6e8fbc9798a/queries/hcl/injections.scm
 
 (heredoc_template
-  (template_literal) @content
-  (heredoc_identifier) @language
-  (#downcase! @language))
+  (template_literal) @injection.content
+  (heredoc_identifier) @injection.language
+  (#downcase! @injection.language))
 
 ; https://github.com/nvim-treesitter/nvim-treesitter/blob/ce4adf11cfe36fc5b0e5bcdce0c7c6e8fbc9798a/queries/terraform/injections.scm
 ; inherits: hcl

extensions/terraform/languages/terraform/injections.scm

@@ -1,9 +1,9 @@
 ; https://github.com/nvim-treesitter/nvim-treesitter/blob/ce4adf11cfe36fc5b0e5bcdce0c7c6e8fbc9798a/queries/hcl/injections.scm
 
 (heredoc_template
-  (template_literal) @content
-  (heredoc_identifier) @language
-  (#downcase! @language))
+  (template_literal) @injection.content
+  (heredoc_identifier) @injection.language
+  (#downcase! @injection.language))
 
 ; https://github.com/nvim-treesitter/nvim-treesitter/blob/ce4adf11cfe36fc5b0e5bcdce0c7c6e8fbc9798a/queries/terraform/injections.scm
 ; inherits: hcl