fix: #7196
1. Refactor exp_ref_by_name in `dvc/repo/experiments/utils.py`.
In previous the exp_ref_by_name walk throught all of the references to
match only one exp name. This makes multi exp name seeking to be a job
of `O(mn)` complexity, Walking though the exp ref and return all of the
exp ref with greatly reduce this complexity to `O(n)`
Co-authored-by: Peter Rowlands (변기호) <[email protected]>
karajan1001andPeter Rowlands
b6a2402d27