ci: add focused PR benchmark labels #6617

Job	Run time
Rust tests (miri)	1m 36s
C++ API (coverage)	1m 4s
Rust/C++ FFI tests (tsan)	1m 55s
Rust tests (tsan)	6m 35s
Rust tests (asan)	6m 57s
Rust/C++ FFI tests (asan)	2m 12s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	5s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-1s
DuckDB libraries available in R2	3s
Rust tests (coverage) (tests)	6m 31s
	26m 57s

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