testdata: std.manifestJsonEx text cases more types

This commit adds test cases for more types to ensure that
std.manifestJsonEx continues to work with all types that may be given
as the `value` parameter.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

testdata/builtinManifestJsonEx.golden

@@ -1,4 +1,8 @@
 {
-   "a": "{\n  \"bam\": true,\n  \"bar\": \"bar\",\n  \"baz\": 1,\n  \"bazel\": 1.42,\n  \"bim\": false,\n  \"blamo\": {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  },\n  \"boom\": -1,\n  \"foo\": \"bar\"\n}",
-   "b": "[\n  \"bar\",\n  \"bar\",\n  1,\n  1.42,\n  -1,\n  false,\n  true,\n  {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  }\n]"
+   "array": "[\n  \"bar\",\n  \"bar\",\n  1,\n  1.42,\n  -1,\n  false,\n  true,\n  {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  }\n]",
+   "bool": "true",
+   "null": "null",
+   "number": "42",
+   "object": "{\n  \"bam\": true,\n  \"bar\": \"bar\",\n  \"baz\": 1,\n  \"bazel\": 1.42,\n  \"bim\": false,\n  \"blamo\": {\n    \"cereal\": [\n      \"<>& fizbuzz\"\n    ],\n    \"treats\": [\n      {\n        \"name\": \"chocolate\"\n      }\n    ]\n  },\n  \"boom\": -1,\n  \"foo\": \"bar\"\n}",
+   "string": "\"foo\""
 }

testdata/builtinManifestJsonEx.jsonnet

@@ -1,4 +1,4 @@
-local a = {
+local object = {
   foo: 'bar',
   bar: self.foo,
   baz: 1,
@@ -19,9 +19,9 @@ local a = {
   },
 };
 
-local b = [
+local array = [
   'bar',
-  a.foo,
+  object.foo,
   1,
   1.42,
   -1,
@@ -41,6 +41,10 @@ local b = [
 ];
 
 {
-  a: std.manifestJsonEx(a, '  '),
-  b: std.manifestJsonEx(b, '  '),
+  array: std.manifestJsonEx(array, '  '),
+  bool: std.manifestJsonEx(true, '   '),
+  'null': std.manifestJsonEx(null, '   '),
+  object: std.manifestJsonEx(object, '  '),
+  number: std.manifestJsonEx(42, '   '),
+  string: std.manifestJsonEx('foo', '   '),
 }