Make the fix conservative by handling the missing type kinds instead of removing them from default symbol specifications.

Note that the fixer is still MEF exported from CodeStyle layer due to #42218, but has still been ported to enabled running ported tests in the CodeStyle layer. Tests failing in CodeStyle layer due to #42218 have been skipped for CodeStyle

Enable test framework to serialize naming style options to editorconfig. This is needed to run the naming style analyzer/fixer tests from CodeStyle layer. This also helped find couple of bugs in the EditorConfigNamingStyleParser, which are fixed as part of this commit.

This is now annotated as non-null, so the check is pointless.

These are all functions are supposed to work equally well with
regular documents, additional documents, and analyzer config documents.
However, they were all calling GetDocument that would only work with
the first kind.