orchestrator: add html report url to connector health messages

[alafanechere]

What

Addresses #27497
Now that we have nice HTML test report we want them to be easily accessible from nightly build reports.

How

• Add a new column with links to the nightly test report on pages like this on
• Add a link to these pages in the messages sent to #connector-health

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ alafanechere
❌ Octavia Squidington III

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[bnchrch]