`@tensor begin ... end` blocks shown uncovered in Codecov

[Yue-Zhengyuan]

See this Codecov report on PEPSKit, for example.

[Yue-Zhengyuan]

@plansor and @planar in TensorKit may have the same issue.

[kshyatt]

This is an issue with Julia's lowering, I think?

[lkdvos]

I'm not sure, it might also be something where we are generating expressions without linenumbers, which probably screws up the codecov. I'm not sure if there is a way to fix this for multiline stuff though, I was thinking of seeing if my robot friend could find out anything about this