refactor: remove historical migration scripts

[kingpinXD]

Description

Closes : #3585

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

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[kingpinXD]

I think these functions can be removed, but I see the older ones were still kept so I have followed the same pattern .
I will remove them if no one has any objections to it