Add border visual tests

[BretJohnson]

Description of Change

Fully enable the border tests, started as part of #17310.
We decided to break the tests out of 17310, into this PR, so we can merge 17310 ASAP and merge the test PR (this one) shortly after.

So the sequence should be:

• Finalize [Windows] Fixes border content clipping #17310 and merge it (hopefully very shortly today).
• Rebase this PR on latest main.
• Finalize and merge this PR, adding the UI tests (hopefully later today - it's close, but we don't want to block on it).

[jsuarezruiz]

System.TimeoutException : Timed out waiting for element...
Launching the test processes on CI again to see if can pass the added ones.

[ghost]

Hi @BretJohnson. We have added the "s/pr-needs-author-input" label to this issue, which indicates that we have an open question/action for you before we can take further action. This PRwill be closed automatically in 14 days if we do not hear back from you by then - please feel free to re-open it if you come back to this PR after that time.

[ghost]

Hi @BretJohnson.
It seems you haven't touched this PR for the last two weeks. To avoid accumulating old PRs, we're marking it as stale. As a result, it will be closed if no further activity occurs within 4 days of this comment. You can learn more about our Issue Management Policies here.

[ghost]

Hi @BretJohnson.
It seems you haven't touched this PR for the last two weeks. To avoid accumulating old PRs, we're marking it as stale. As a result, it will be closed if no further activity occurs within 4 days of this comment. You can learn more about our Issue Management Policies here.