[Bug][Webhook] start_time field is required but Config-UI says it's optional

[hezyin]

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• I had searched in the issues and found no similar issues.

What happened

Version: v0.17.0-beta3

This issue probably only requires some text update on the Config-UI side. Note how Config-UI suggests that start_time is optional in the following screenshot:

But if I got the following error when I didn't pass start_time and I was able to succeed after passing start_time:

When updating the curl command template, could you please also format it like below and use single quotation marks outside the curly braces so that we don't need to escape double quotation marks inside the payload?

(this is from webhook plugin doc page: https://devlake.apache.org/docs/next/Plugins/webhook)

What do you expect to happen

See above

How to reproduce

See above

Anything else

No response

Version

main

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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