[fa] add back migration_flag for exchanges #71642

Job	Run time
permission-check	4s
file_change_determinator	12s
determine-docker-build-metadata	1s
test-target-determinator	4m 35s
fetch-last-released-docker-image-tag	1m 34s
rust-images-consensus-only-perf-test	0s
rust-images-performance	0s
rust-images-failpoints	0s
rust-images / rust-all	11m 50s
forge-multiregion-test	0s
forge-consensus-only-perf-test	0s
cli-e2e-tests / run-cli-tests	4m 36s
forge-e2e-test / forge	13m 7s
faucet-tests-main / run-tests-main	0s
forge-compat-test / forge	12m 23s
forge-framework-upgrade-test / forge	9s
node-api-compatibility-tests / node-api-compatibility-tests	48s
	49m 19s

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