FINERACT-2455: WC - Amortization schedule endpoint refactor

[budaidev]

Amortization schedule endpoint should return only… the useful information

Description

Describe the changes made and why they were made. (Ignore if these details are present on the associated Apache Fineract JIRA ticket.)

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[adamsaghy]

LGTM

[galovics]

LGTM

[adamsaghy]

@budaidev Please resolve the conflicts.