Reinstate AbstractXContentFilteringTestCase#testDotsAndDoubleWildcardInExcludedFieldName

[DaveCTurner]

AbstractXContentFilteringTestCase#testDotsAndDoubleWildcardInExcludedFieldName is marked as AwaitsFix, linking #80160, but this issue is closed. We should either remove the AwaitsFix marker, open a new issue to track the bug, or remove the test if it is invalid.

[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[thecoop]

The test is still failing, but for a different reason. I'm opening a new ticket to cover it.

[thecoop]

#92632 opened for the new failure reason