Pass 'not' to commit count (#24473)

Due to #24409 , we can now specify '--not' when getting all commits from
a repo to exclude commits from a different branch.

When I wrote that PR, I forgot to also update the code that counts the
number of commits in the repo. So now, if the --not option is used, it
may return too many commits, which can indicate that another page of
data is available when it is not.

This PR passes --not to the commands that count the number of commits in
a repo

modules/context/repo.go

@@ -208,7 +208,12 @@ func (r *Repository) GetCommitGraphsCount(ctx context.Context, hidePRRefs bool,
 		if len(branches) == 0 {
 			return git.AllCommitsCount(ctx, r.Repository.RepoPath(), hidePRRefs, files...)
 		}
-		return git.CommitsCountFiles(ctx, r.Repository.RepoPath(), branches, files)
+		return git.CommitsCount(ctx,
+			git.CommitsCountOptions{
+				RepoPath: r.Repository.RepoPath(),
+				Revision: branches,
+				RelPath:  files,
+			})
 	})
 }