Enable FLUX_TEST_REACTANT in AMD pipeline configuration #3833

Job	Run time
Documentation	14m 31s
Julia 1 - ubuntu-latest - x64	41m 43s
Julia 1.10 - ubuntu-latest - x64	35m 57s
Julia 1 - windows-latest - x64	51m 1s
Julia 1 - macOS-latest - aarch64	58m 4s
Julia nightly - ubuntu-latest - x64	3m 56s
	3h 25m 12s

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