[javadoc] IDEA-285556 Support language injection into snippet

Implement updating the content of a snippet tag with the help from a method implementer. A snippet might invoke overriding a method though a completion and when a parent method is inserted it might contain javadoc. In this case it's impossible to recreate a snippet tag because the new text for the tag contains "/**" and "*/" that come from the parent method's javadoc. The implemented method implementer helps to strip a method's javadoc if it's present.

Signed-off-by: Nikita Eshkeev <nikita.eshkeev@jetbrains.com>

GitOrigin-RevId: 42b315ed2670701e50574a383f0442df69accd35

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/javaDoc/SnippetMethod.java

@@ -1,5 +1,5 @@
 /** {<warning descr="'@snippet' tag is not available at this language level">@snippet</warning> :
- * void f() {}
+ * void f<error descr="';' expected">(</error><error descr="Expression expected">)</error> {}
  * }
  */
 class A {