writers/data.nix: Remove duplicate implementations

pkgs/build-support/writers/data.nix

···
-{ lib, runCommand, dasel }:
+{ lib, pkgs, formats, runCommand, dasel }:
 let
   daselBin = lib.getExe dasel;
 
···
         mkdir -p $out/$(dirname "${nameOrPath}")
         mv tmp $out/${nameOrPath}
       ''}
-    '';
+    '');
 
-  # Writes the content to text.
-  #
-  # Example:
-  #   writeText "filename.txt" "file content"
-  writeText = makeDataWriter {
-    input = toString;
-    output = "cp $inputPath $out";
-  };
+  inherit (pkgs) writeText;
 
   # Writes the content to a JSON file.
   #
   # Example:
   #   writeJSON "data.json" { hello = "world"; }
-  writeJSON = makeDataWriter {
-    input = builtins.toJSON;
-    output = "${daselBin} -f $inputPath -r json -w json > $out";
-  };
+  writeJSON = (pkgs.formats.json {}).generate;
 
   # Writes the content to a TOML file.
   #
   # Example:
   #   writeTOML "data.toml" { hello = "world"; }
-  writeTOML = makeDataWriter {
-    input = builtins.toJSON;
-    output = "${daselBin} -f $inputPath -r json -w toml > $out";
-  };
+  writeTOML = (pkgs.formats.toml {}).generate;
 
   # Writes the content to a YAML file.
   #
   # Example:
   #   writeYAML "data.yaml" { hello = "world"; }
-  writeYAML = makeDataWriter {
-    input = builtins.toJSON;
-    output = "${daselBin} -f $inputPath -r json -w yaml > $out";
-  };
+  writeYAML = (pkgs.formats.yaml {}).generate;
 }

pkgs/build-support/writers/test.nix

···
 
     toml = expectDataEqual {
       file = writeTOML "data.toml" { hello = "world"; };
-      expected = "hello = 'world'\n";
+      expected = ''
+        hello = "world"
+      '';
     };
 
     yaml = expectDataEqual {