fixed determine-test-metadata to use current branch as default branch #67379

Job	Run time
file_change_determinator	15s
rust-doc-tests	4m 26s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-unit-tests	0s
general-lints	29s
rust-lints	3m 32s
rust-cargo-deny	2m 0s
rust-build-cached-packages	1m 57s
rust-check-merge-base	1m 52s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	25m 4s
rust-targeted-unit-tests	2m 46s
	42m 21s

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