test: Get rid of wget in foss tests

[nettle]

Why:
We still have wget as environment dependency
managed by micromamba, but package download
can be implemented in python instead.

What:

• Download package using python
• Remove wget from micromamba

[furtib]

LGTM!

I was theorizing about this test in particular a lot. (How to speed it up.)
I think we have already spent way too much time on this, but when we have a relatively empty backlog, we might consider this:

I was thinking of moving the downloading out of the test action entirely and having Bazel manage it. (This way we don't necessarily need to redownload the archives for every run.)

[nettle]

I was thinking of moving the downloading out of the test action entirely and having Bazel manage it. (This way we don't necessarily need to redownload the archives for every run.)

Good thinking @furtib!
Yes, it is possible, and it is possible different ways.
One way is to make foss projects/packages as external bazel modules, see #300
And, yes, we should get back to this problem at some point...