Revert "build: remove git mailmap usage"

This reverts commit 426acbc.

Reverting because the latest dev cluster has been updated with git 2.43.0 now, which supports
the mailmap feature in git for-each-ref command

Signed-off-by: Ye Xiang <[email protected]>

Author: yexiang-aws

contrib/scripts/generate_debian_changelog.sh

@@ -1,5 +1,15 @@
 #!/bin/bash
 
+fmt=" \
+tagname=%(refname:short) \
+tagger_name=%(taggername:mailmap) \
+tagger_email=%(taggeremail:mailmap) \
+tagger_when=%(taggerdate) \
+committer_name=%(committername:mailmap) \
+committer_email=%(committeremail:mailmap) \
+committer_when=%(committerdate) \
+"
+
 if [ $# -eq 0 ]; then
 	tag=HEAD
 else
@@ -12,8 +22,7 @@ if [ $? -ne 0 ]; then
 	exit 0
 fi
 
-git log --use-mailmap --no-walk --format="tagname='%D' tagger_name='%aN' tagger_email='<%aE>' tagger_when='%ad' committer_name='%cN' committer_email='<%cE>' committer_when='%cd'" \
-    --date="format:%a %b %-d %T %Y %z" $(git tag --merged "$tag") | sed "s/tagname='tag: \([^,']*\)'/tagname='\1'/" | {
+git for-each-ref --shell --sort=-v:refname --format "$fmt" --merged "$tag" | {
 	while read line; do
 		eval $line
 		(echo ${tagname} | grep -qE '^v[0-9]') || continue