Rename EMPTY_TREE_ID constant
What does this MR do and why?
Contributes to #441465 (closed)
Problem
EMPTY_TREE_ID
is different for SHA1 and SHA256 repositories.
Currently, it's not clear which one it represents.
Solution
Rename EMPTY_TREE_ID
into SHA1_EMPTY_TREE_ID
Edited by Vasilii Iakliushin