trivial: rename ExecutedTrees -> LedgerSummary #71259

Job	Run time
file_change_determinator	13s
rust-doc-tests	4m 59s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-unit-tests	0s
rust-cargo-deny	1m 54s
rust-smoke-tests	27m 45s
rust-lints	3m 35s
general-lints	29s
rust-build-cached-packages	2m 5s
rust-check-merge-base	1m 12s
rust-cryptohasher-domain-separation-check	0s
rust-targeted-unit-tests	12m 25s
	54m 37s

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