Feat update treasury proposal amount field to accept ada instead of lovelace

[MihajlovicMilos1995]

List of changes

• Change update treasury proposal amount field to accept ada instead of lovelace

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

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✅ All checks succeeded

[github-actions]

@MihajlovicMilos1995
This PR is in the tag: dev-e86970a065f6e310ca591f7093ffb9d6f5689431-381 , for backend service