Consider context in raw serialization (#106163)

With this commit we use `writeRawValue` instead of `writeRaw` when
serializing raw strings as XContent. The latter method does not consider
context (e.g. is the value being written as part of an array and
requires a comma separator?) whereas the former does. This ensures that
pre-rendered double values as we use them in the flamegraph response are
rendered correctly as XContent.

Closes #106103

libs/x-content/impl/src/main/java/org/elasticsearch/xcontent/provider/json/JsonXContentGenerator.java

@@ -500,7 +500,7 @@ public class JsonXContentGenerator implements XContentGenerator {
     public void writeRawValue(String value) throws IOException {
         try {
             if (supportsRawWrites()) {
-                generator.writeRaw(value);
+                generator.writeRawValue(value);
             } else {
                 // fallback to a regular string for formats that don't allow writing the value as is
                 generator.writeString(value);

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/profiling/10_basic.yml

@@ -166,9 +166,6 @@ teardown:
 
 ---
 "Test flamegraph from profiling-events":
-  - skip:
-      reason: "https://github.com/elastic/elasticsearch/issues/106103"
-      version: "all"
   - do:
       profiling.flamegraph:
         body: >
@@ -195,9 +192,6 @@ teardown:
 
 ---
 "Test flamegraph from test-events":
-  - skip:
-      reason: "https://github.com/elastic/elasticsearch/issues/106103"
-      version: "all"
   - do:
       profiling.flamegraph:
         body: >