✨ (feat) [SYNTHETICS]: adding Step Replay functionality on the extension (first version, debugger free)

[GuilhermeBorges]

What does this PR do? What is the motivation?

This PR adds a new section to the Browser Tests documentation describing the "Step Replay" feature. The section explains what Step Replay is, how to use it, which steps are supported, upcoming improvements, and which step types are not yet supported. It also includes embedded demo videos for each replay mode and a warning panel to clarify current limitations.

Merge instructions

We are waiting for a release
Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/guilherme.oliveira/SYNTH-20461/synthetics-extension-add-step-replay/synthetics/browser_tests/

[aliciascott]

Hi @GuilhermeBorges thank you so much for adding this! I know it looks like a lot of changes, most are for wording, and style, but I did have some questions about the supported/future supported and not supported list. Let me know if you have any questions thanks!

[aliciascott]

Suggested change

	### Step Types Not Yet Supported
	### Step types not supported

I think this section is ok and likely in the future we can add a table with checkboxes so it's easier to distinguish which features are available with step replay.. actually now that I think of it, this might be a better idea, would you want to re-work the supported features and not supported features section in a table similar to: https://docs.datadoghq.com/security/cloud_security_management/setup/supported_deployment_types ? Let me know, I can help with this too.