`stake-tracker` remote externalities tests + improvements #1265

Job	Run time
check-dependency-rules	9s
check-markdown	13s
check-workspace	17s
set-image	7s
check-toml-format	1m 9s
check-rust-feature-propagation	2m 11s
check-umbrella	3m 0s
fmt	1m 18s
test-rust-features	2m 10s
	10m 34s

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