Custom Alert `RESULT_CONDITIONS` missing newlines

Describe the bug

Custom [RESULT_CONDITIONS] is missing the \n like other alerts, specifically the rocketchat one, have. Should be a simple fix.

https://github.com/TwiN/gatus/blob/c93a32107376c84f196bfd5979756a626b28c442/alerting/provider/rocketchat/rocketchat.go#L142

https://github.com/TwiN/gatus/blob/c93a32107376c84f196bfd5979756a626b28c442/alerting/provider/custom/custom.go#L124

What do you see?

What do you expect to see?

List the steps that must be taken to reproduce this issue

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Version

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Additional information

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