DOCS-6460 Adds Creating an HTTP Test with HMAC Authentication Guide

[alai97]

What does this PR do? What is the motivation?

Adds a guide on creating an HTTP test with an HMAC signature + screenshots.

Merge instructions

• [ ] Please merge after reviewing

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/alai97/add-http-tests-with-hmac-auth-guide/synthetics/guide/http-tests-with-hmac

Modified Files

• https://docs-staging.datadoghq.com/alai97/add-http-tests-with-hmac-auth-guide/synthetics/guide/

[HugoPct]

Still waiting for the feature to be released, otherwise lgtm

[ruizb]

Hello @alai97, I've pushed 2 commits to update the screenshots, the JavaScript code snippet, and I also added a couple of bullet points regarding the APIs available in the script sandbox for our users. Feel free to improve the wording/presentation of it!

(feature still not available, but we are very close to it!)

[git-thuerk-done]

Hello @alai97, I've pushed 2 commits to update the screenshots, the JavaScript code snippet, and I also added a couple of bullet points regarding the APIs available in the script sandbox for our users. Feel free to improve the wording/presentation of it!

(feature still not available, but we are very close to it!)

Hi @ruizb I'm taking this one over from @alai97 , thanks for the update! I'll be keeping an eye on this one, just let us know when it's ready :)

[ruizb]

Hello @aliciascott, we can finally merge it! We'll enable the feature for everyone in our app as soon as the link to this documentation page is available publicly 👍