Support essential dapps in DeFi dropdown

[maxaleks]

Description and Related Issue(s)

Resolves #3102

⚠️ Changes in ENV var:

• added isEssentialDapp prop to NEXT_PUBLIC_DEFI_DROPDOWN_ITEMS

Example value:

[{ 'text': 'Swap', 'icon': 'swap', 'dappId': 'swap', 'isEssentialDapp': true }]

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request