[GR-44710] Fix String#slice with negative offset #5161

Job	Run time
build jvm	6m 36s
lint	14m 40s
build native	13m 39s
ruby/spec on CRuby 3.0	3m 31s
ruby/spec on CRuby 3.1	3m 29s
ruby/spec on CRuby 3.2	3m 10s
fast specs	1m 41s
specs :truffle	15m 24s
test integration	9m 55s
specs :language :core	13m 12s
specs :library :cext :security :command_line :tracepoint	10m 45s
run MRI tests on native	18m 17s
test native	3m 24s
	1h 57m 43s

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