test: make more tests green

[AayushSabharwal]

Close #4211

[AayushSabharwal]

I'm consistently stumped by how this manages to have different behavior on LTS, and only in CI.

[ChrisRackauckas]

LTS doesn't obey sources

[AayushSabharwal]

Ah, right thanks. I thought I made the CI script dev packages appropriately, but apparently not.

[AayushSabharwal]

Hmm, but that doesn't explain the ModelingToolkitBase/InterfaceI failure. There's no sources entry in that package.

[AayushSabharwal]

Okay yeah, that isn't it. I made the runtests.jl file dev the appropriate subpackages. Still, I think it's prudent to do it in the CI script instead. The Pkg.status printout is then always correct, and we avoid stacked environments.

[AayushSabharwal]

The print statements seem to affect tests passing. In fact, they affect completely unrelated tests.

[AayushSabharwal]

Hopefully the suggestion in #4211 fixes the stochasticity here

[AayushSabharwal]

It doesn't look like the fix worked

[AayushSabharwal]

It seems the fix in #4252 worked. The failures in LTS/extensions seem similar, so I'm guessing one of the dynamic optimization extensions needs a similar change.