enhance(admin): allow regenerating access tokens for bot accounts (#40109)

Bot accounts cannot sign in, so admins manage their access tokens, but
the regenerate button was hidden for them. This adds an admin route to
regenerate a bot's token.

Token regeneration is now also recorded in the audit log.

Fixes: https://github.com/go-gitea/gitea/issues/40074
Co-authored-by: silverwind <me@silverwind.io>

routers/web/admin/users.go

@@ -388,6 +388,12 @@ func DeleteBotToken(ctx *context.Context) {
 	}
 }
 
+func RegenerateBotToken(ctx *context.Context) {
+	if u := getTargetBot(ctx); u != nil {
+		user_setting.RegenerateAccessToken(ctx, u)
+	}
+}
+
 func editUserCommon(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("admin.users.edit_account")
 	ctx.Data["PageIsAdminUsers"] = true