[receiver/httpcheck] deprecate endpoint configuration

[codeboten]

Component(s)

receiver/httpcheck

Is your feature request related to a problem? Please describe.

As a result of #37265, it's now possible to set multiple endpoints at the same time. This is an improvement over the previous configuration, but now there are two ways to configure endpoint and endpoints which is somewhat confusing.

Describe the solution you'd like

It would be great to only support endpoints and prevent users from setting endpoint. This could be done via validation, though i would expect the field to warn users as deprecated first before returning an error.

Describe alternatives you've considered

No response

Additional context

Note that as was mentioned in this comment, the field comes from confighttp, so it couldn't be removed completely, unless we were to remove the dependency on confighttp.

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