fix: remove log line from listpullreqs.go and additional release.sh fixes (#2790)

hack/release.sh

@@ -54,7 +54,7 @@ sed 's/|/\n/g' $TEMP_CHANGELOG > $TEMP_CHANGELOG_FIXED
 # Prepend to CHANGELOG.md
 cat $TEMP_CHANGELOG_FIXED CHANGELOG.md > TEMP && mv TEMP CHANGELOG.md
 
-echo "Prepended the following to release information to CHANGELOG.md"
+echo "Prepended the following release information to CHANGELOG.md"
 echo ""
 cat  $TEMP_CHANGELOG_FIXED
 
@@ -71,3 +71,6 @@ sed -i.bak \
     -e "s|VERSION_MINOR ?=.*|VERSION_MINOR ?= $VERSION_MINOR|" \
     -e "s|VERSION_BUILD ?=.*|VERSION_BUILD ?= $VERSION_BUILD|" \
     ./Makefile
+
+# Cleanup
+rm ./Makefile.bak

hack/release_notes/listpullreqs.go

@@ -58,7 +58,6 @@ func printPullRequests() {
 
 	releases, _, _ := client.Repositories.ListReleases(context.Background(), org, repo, &github.ListOptions{})
 	lastReleaseTime := *releases[0].PublishedAt
-	fmt.Println(fmt.Sprintf("Collecting pull request that were merged since the last release: %s (%s)", *releases[0].TagName, lastReleaseTime))
 
 	listSize := 1
 	seen := map[int]bool{}