lando/lando#3744: Check to make sure default url isn't being overridden in proxy settings.

[reynoldsalec]

Bare minimum self-checks

What do you think of a person who only does the bare minimum?

• [ ] I've updated this PR with the latest code from main
• [ ] I've done a cursory QA pass of my code locally
• [ ] I've ensured all automated status check and tests pass
• [ ] I've connected this PR to an issue

Pieces of flare

• [ ] I've written a unit or functional test for my code
• [ ] I've updated relevant documentation it my code changes it
• [ ] I've updated this repo's README if my code changes it
• [ ] I've updated this repo's CHANGELOG with my change unless its a trivial change (like updating a typo in the docs)

Finally

• [ ] I've requested a review with relevant people

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