Refresh remote session during long migrations #15445

Job	Run time
Run OCaml tests (ubuntu-22.04, 4.14.2, false)	6m 36s
Run OCaml tests (ubuntu-22.04, 5.4.0, true)	7m 35s
Run OCaml tests (ubuntu-22.04-arm, 4.14.2, true)	6m 8s
	20m 19s

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