DAOS-14982 cart: Set fork safe env var for IB.

[jgmoore-or]

Skip-build-leap15-icc: true Skip-build-el8-gcc: true Skip-func-test-vm: true Skip-unit-tests: true Test-tag: pr daily_regression Test-provider: ucx+ud_x Skip-func-hw-test-medium-ucx-provider: false Skip-func-hw-test-medium-verbs-provider: true

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