fix: enrich targets now accepts any scheme

[niklastreml]

Motivation

Closes #148

This improves the logic in enrichTargets to account for any scheme, be that http, https, tcp whatever floats your boat, as long as it's a valid url we're happy.

Changes

Parse the url into a net.Url so we grab the dns name in an easier way for the dns check.

For additional information look at the commits.

Tests done

I've tested it with the latency and dns check enabled using mixed set of targets configured with HTTP and HTTPS. Seemed to work fine

• [x] Unit tests succeeded
• [x] E2E tests succeeded

TODO

• [x] I've assigned this PR to myself
• [x] I've labeled this PR correctly

[niklastreml]

as far as the flaky test goes, I don't have time to look into it, but I'll file a bug report

[niklastreml]

Created the issue #150