[FileFormats.LP] fix reading models with default bounds #2121
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Reported on discourse: https://discourse.julialang.org/t/reading-jump-model-lower-bound-already-set/96156
Looks like my fix in #1810 wasn't sufficient, and I didn't test round-tripping our LP files.
I guess it went unnoticed because we could read in other peoples LP files and write out legal files, but we couldn't read the files that we created 😢.
I've now added a bunch of tests that should have been added in #1810.