Removed old loan UI related code and files

[shamim-emon]

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• I've read the Contribution Guidelines and my PR doesn't break the rules.
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• I confirm that I've run the code locally and everything works as expected.
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What's changed?

Describe with a few bullets what's new:

• I've removed all old loan UI related code and files

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What may go wrong if we merge your PR?

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In what cases won't your code work?

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Does this PR close any GitHub issues? (do not delete)

• Closes [Refactor] Simplify the Loans screen by making the Tabular UI the default one #3541

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[ILIYANGERMANOV]

Thanks for the cleanup!