Log web hook execution timeout events

What does this MR do?

This MRs adds web hook logging for 2 failure scenarios: request timeout and unreachable host errors.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Web hooks failing for these reasons were not shown on the web hook log UI

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?