Add retry mechanism to `test_ucx_config_w_env_var` #1175

Job	Run time
check-nightly-ci	4s
telemetry-setup	7s
checks / check-style	1m 48s
checks / other-checks	48s
changed-files / Check changed files	11s
devcontainer	0s
conda-cpp-build	0s
wheel-build-distributed-ucxx	0s
wheel-build-libucxx	0s
conda-cpp-tests	0s
conda-python-tests	0s
conda-python-distributed-tests	0s
docs-build	0s
wheel-build-ucxx	0s
wheel-tests-distributed-ucxx	0s
wheel-tests-ucxx	0s
pr-builder / run	1s
telemetry-summarize	18s
	3m 17s

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