Description

This PR adds the validation to WeChat APIURL config by changing type in CR from string to URL and add the validation method in the code.

Type of change

What type of changes does your code introduce to the Prometheus operator? Put an x in the box that apply.

• CHANGE (fix or feature that would cause existing functionality to not work as expected)
• FEATURE (non-breaking change which adds functionality)
• BUGFIX (non-breaking change which fixes an issue)
• ENHANCEMENT (non-breaking change which improves existing functionality)
• NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Verification

Unit Testing

Changelog entry

Please put a one-line changelog entry below. This will be copied to the changelog file during the release process.

Description
This PR adds the validation to WeChat APIURL config by changing type in CR from string to URL.

Type of change
What type of changes does your code introduce to the Prometheus operator? Put an x in the box that apply.

 CHANGE (fix or feature that would cause existing functionality to not work as expected)
 FEATURE (non-breaking change which adds functionality)
 BUGFIX (non-breaking change which fixes an issue)
 ENHANCEMENT (non-breaking change which improves existing functionality)
 NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)
Verification
Unit Testing

Changelog entry
- Add API URL validation for Alertmanager Telegram receiver custom resource