Use tag's database num commits instead of read the commit counts from git data

[lunny]

It will be slow to get the commits count for a tag of a big repository. But the commits count has been stored in the table release of the database. We could just use that value.

 git-run duration=1.4821s func.caller=git.CommitsCount git.command="/usr/bin/git ...global... rev-list --count 1aa3f624c40852b36a14c479daae1fc879f3d3bf"

[wxiaoguang]

I do not think it's right to keep patching the old code by more hacky code.

Why can't it get a clear solution?

[wxiaoguang]

Although the goal is good, I do not think the approach is right or there is enough time to take it into 1.24

[lunny]

This should be replaced by #34311