Move end-to-end tests to a common place

While for unit tests it is best practice to replicate the layout
of the source tree, for end-to-end tests, this is less so. This
is particularly true, as the distinction between the tests for two
tools is a bit blurry; some tests for just still use just-mr as a
launcher, and, e.g., the fetch test for just-mr uses just to carry
out the garbage collection. Therefore, move all end-to-end tests
together so that we also have a joinded target for precisely the
end-to-end tests.

In this reorganisation also indicate more explicitly which tests are
also available for the bootstrap multi-repo tool. That information
was so far hidden by the fact that in the other directory the tool
dependency would not dispatch on TEST_BOOTSTRAP_JUST_MR.

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