Fix attribute only in full text function not found #137395
                
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A verification expection is thrown if there is LOOKUP JOIN with a FULL TEXT FUNCTION on the LOOKUP INDEX. The field from the LOOKUP INDEX is only used in the full text function. There is KEEP that selects some fields, but not the field in question.
The fix involves making sure that all the fields from the JoinOnCondition of the LOOKUP JOIN are collected during resolveFieldNames() to be used for field caps.
Resolves #137396