Fix/proposal submission wallet issue

[NabinKawan]

List of changes

• Added proposal wallet setup to generate temporary proposal wallets
• Added proposal project on playwright config
• Renamed proposalSubmissionFunction.tx.spec.ts to proposalSubmissionFunction.proposal.spec.ts
• Added proposal submit test only on the proposal

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