Automatically create share link when submitting project to marketplace

[natapokie]

Description

1. What is this PR about (link the issue and add a short description)

Better communication of the Marketplace share link

• when submitting a project to the Marketplace, a link called "Marketplace Link" will be automatically created
• when a project is unlisted from the Marketplace, the link will be removed

Steps for reproduction

1. Submit your project to the marketplace (Project Settings > Marketplace > Start Review)
2. Open the share dialog -- you will see the "Marketplace Link" created automatically
   
3. Unlist a project from the marketplace (Project Settings > Marketplace > Start Review)
4. Open the share dialog -- you will see the "Marketplace Link" removed

Code Review

• hi @kof, I need you to do
  • please review the comments on Share link for marketplace submissions isn't communicated well #4424, thanks!

Before requesting a review

• made a self-review
• added inline comments where things may be not obvious (the "why", not "what")

Before merging

• tested locally and on preview environment (preview dev login: 0000)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env file

[github-actions]

Hey there and thank you for opening this pull request! 👋🏼

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• revert - Reverts a previous commit
• experimental - Flagged feature

[kof]

identifying an existing link by name would be very fragile

[kof]

since name is user defined, can be changed

[kof]

I think it should be possible to not delete anything, but instead create it once and just keep it hidden. Additionally maybe need to think about removal from marketplace too, so deletion might be still needed but when removed from marketplace approved projects

[kof]

Closing for now as it needs more work