[ML] Do not add runtime section to DFA dest index mappings unnecessarily #69329
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Since config runtime mappings were added to data frame analytics jobs
in #69183, when we create the destination index we add a
runtime
section in its mappings regardless of whether the job config contains
any runtime fields. This causes failures in the BWC tests when in a
mixed cluster where there are nodes versioned before runtime fields
were introduced.
This is the first part of the fix were we do not create a
runtime
sectionin the destination index mappings unless necessary.