Remove dependencies to deprecated bundle org.eclipse.xtext.generator for Xtext 2.27 compat
Xtext 2.27 (included in Eclipse Release 2022-06) moves the deprecated org.eclipse.xtext.generator bundle to an xtext-extras feature that isn't part of Eclipse 2022-06: https://www.eclipse.org/Xtext/releasenotes.html#/releasenotes/2022/05/30/version-2-27-0
For etrice, this is a breaking change. There are a few etrice bundles that have dependencies on org.eclipse.xtext.generator, although mostly it looks like they are not actually using the old xtext generator anymore. For these bundles, it seems sufficient to just remove the dependency from META-INF.
The one exception is org.eclipse.etrice.generator.fsmtest, which still uses the the old deprecated xtext generator. For this bundle the MWE2 workflow needs to be converted to use the newer xtext generator.
Also need to consider how to communicate this change for the corresponding etrice release.