Replace 'project' icon with 'earth' for an Explore Projects card

Julia Miocene is OOO until mid-Januaryrequested to merge
update-welcome-screen-icon into master

What does this MR do and why?

Replace 'project' icon with 'earth' for an Explore Projects card.

References

Design issue -> #530988 (closed)

UX Paper Cuts planning issue -> #512693 (closed)

Screenshots or screen recordings

Before After
CleanShot_2025-04-02_at_13.37.06_2x CleanShot_2025-04-02_at_13.38.32_2x

How to set up and validate locally

  1. Go to admin section https://gdk.test:3000/admin/users
  2. Choose any user with no projects and no groups
  3. Impersonate this user
  4. Now you should be redirected to the main page and see the welcome screen

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