Test for HTTP response header

[kingfisher77]

⚠️ Please verify that this feature request has NOT been suggested before.

• I checked and didn't find similar feature request

🏷️ Feature Request Type

New Notification, New Monitor, UI Feature

🔖 Feature description

We want to test for the presence of an HTTP response header.

✔️ Solution

In the user interface, we should be able to add entries for HTTP response headers that are tested for presence and/or a specific value.

For example: X-Robots tag = "noindex, nofollow"

❓ Alternatives

No response

📝 Additional Context

We are willing to donate to the project.

[CommanderStorm]

Duplicate of #3568

=> TLDR: I think implementing this should be slotted after #3919 to save on needed effort