algo/tst/shouldget/trb+- : add a should-vdj test for trb+ sequence found in...

algo/tst/shouldget/trb+- : add a should-vdj test for trb+ sequence found in Necker; rm old corresponding should-get test & seq

algo/tests/trb-bd2-bj2-3-incomplete.should_get

-!LAUNCH: ../../vidjil -e 10 -A -i -g ../../germline ../../data/trb-bd2-bj2-3.fa
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-$ Segment all 5 reads, thanks to -i
-1:junction detected in 1 reads .100..
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