[Relay][Keras][Bugfix] fix the converters of GRU and SimpleRNN about the go_backwards attribute #15829
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Two similar bugs with the issue: #15176
For the convert function of GRU and SimpleRNN in the Keras frontend, they overlook the parsing for
go_backwards
attribute.Thus, they can lead to wrong inference results.
This PR fixed them and added two corresponding regression tests.
cc @echuraev @Hzfengsy @merrymercy