Playwright UI tests for RFP and proposals workflow

[Megha-Dev-19]

RFP Test cases

• [x] Create RFP
• [x] Edit RFP
• [x] Edit RFP with "Don't ask again" enabled
• [ ] Edit RFP timeline
  • [ ] Accepting submission
  • [ ] Proposal selected
  • [x] Cancelled
• [x] RFP Feed Page
• [ ] View RFP Page
• [ ] Comment on RFP

Proposals Test cases

• [x] Create Proposal
  • [x] Submit Draft
  • [ ] Submit Review
• [ ] Edit Proposal
• [x] Edit Proposal timeline ( only implemented in main DevHUB project )
  • [x] #950
  • [ ] Payment
  • [ ] Funded
• [x] Comment on Proposal

Rather than replicating the proposal test cases to multiple instances, we should rather do #777 first so that we can maintain these tests in one place.