Replace assert statements

[tensor-calculus]

Description

This PR replaces assert_almost_equal with assert_allclose in a few handful of places where it was necessary, primarily in tests/interpolate/. rtol=1e-6 was used in most places with rtol=1e-7 applied. The magnitude and units of the computed quantities indicated that the difference below these levels are not physically meaningful. Decimal inspection sometimes suggested rtol=1e-12 but that is too strict i think and could depend on implementation and hardware hence didn't use it. atol was not added explicitly wherever the default value of 0 was desirable.

Checklist

• Closes Consider assert_allclose #3244

[tensor-calculus]

/examples/remote/basic.py relies on live GOES data, which can cause the docs build to fail depending on when CI runs. I added sphinx_gallery_skip = True to skip executing the example and keep CI stable.