[BUG] Monitor does not use the configured timezone and fallbacks to UTC+0 time

[tangcl]

What is the bug?
monitor alerting timezone is wrong

How can one reproduce the bug?
Steps to reproduce the behavior:

1. my timezone is GMT+8
2. I have set opensearch-dashboard time zone=Asia/Shanghai
3. open a trigger's alerting, and press button "Preview message"
4. ctx.periodStart is utc+0

What is the expected behavior?
Press "Preview message" ,and "ctx.periodStart" timezone is Asia/Shanghai

What is your host/environment?

• OS: [CentOS 7.9]
• Version [2.11]

Do you have any screenshots?

period_end is right timestamp, but code "alerting-dashboards-plugin/public/pages/CreateTrigger/utils/helper.js" line number 59 show me it use utc:

Do you have any additional context?
I think this code should change like "moment.utc(_.get(executeResponse, 'period_start', Date.now())).local().format()