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@koppor i forgot to remove the comments that i usually do to see what new things i added.
please check once and let me know

I unified the migration by extending addICORERankingFieldToGeneralTab
The method now checks for the old default General tab field set and resets to the current defaults, which include both ICORE ranking and eprinttype.
This removes duplicated logic and keeps General tab migrations in one place.
Along with this in new pull request i removed the comments that i kept for my understanding

@koppor i changed the method name from icore to migrateGeneralTabDefaultFields now the method migrates the General tab defaults when the user still has an old default setup.

• i also fixed the changelog link problem .
  and as instructed i read alpha 3 release now we handle both before alpha 3 and after alha 3 release changes
  for that i split the migration function into two cases
  pre and post .