fixed determine-test-metadata to use current branch as default branch #67304

Job	Run time
file_change_determinator	13s
rust-consensus-only-unit-test	0s
rust-unit-tests	0s
rust-doc-tests	0s
rust-consensus-only-smoke-test	0s
rust-lints	3m 24s
rust-cargo-deny	1m 35s
general-lints	29s
rust-check-merge-base	1m 6s
rust-cryptohasher-domain-separation-check	0s
rust-targeted-unit-tests	3m 7s
rust-smoke-tests	0s
rust-build-cached-packages	0s
	9m 54s

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