Add migration for updating current value for yaml bytes size

What does this MR do and why?

Adds migration to update current value of max_yaml_bytes_size to new default if the current value is old default. Updates to + 20% from current value if current value is not the old default or the new default. Leaves the value as is if it is new default.

old default was 1.MB

new default is 2.MB

Related MR for updating the new default using a migration - !160826 (merged)

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Related to #475255 (closed)