SQ Plugin: Remove the sonar runtime checks for versions prior 9.9

[costin-zaharia-sonarsource]

Currently, the minimum supported version of SonarQube API is 9.9. See: https://github.com/SonarSource/sonar-dotnet/blob/master/sonar-csharp-plugin/pom.xml#L41

An older version of SonarQube will not start with the latest versions of sonar-dotnet plugins. Due to this, we can remove all the custom code that handles old versions of SQ API.

In the Java code search for Version.create( to find these cases.