Dynamic beans support for content blocks doesn't generate method getContentBlocks for a contentblocks field added via essentials

As mentioned in HSTTWO-4676, the method getContentBlocks does not get generated for a contentblocks field added via essentials.

Reproduction:

• Create a 14 project from the archetype
• Add the news feature via essentials
• Add a content blocks field to the news document type, via essentials
• Add the following snippet anywhere in /repository-data/webfiles/src/main/resources/site/freemarker/hstdefault/newspage-main.ftl:

  <#list document.class.methods as m>
      ${m.toString()}<br/>
  </#list>

• Expected (but absent) : a method named getContentBlocks, with a signature like:

  public java.util.List org.example.beans.NewsDocument$Newsdocument$SvmMpEPx.getContentblocks()