ci: Removing usage of legacy runners

[campaigner-prod]

This repo is still using runner:main and/or runner:docker
which are legacy runners that will be decommissioned soon
due to running on EOL OS.
Campaign ran by @jorgetomtz

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (BenoitZugmeyer)[https://github.com/BenoitZugmeyer]
❌ @campaigner-prod[bot]
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	167.98 KiB	167.98 KiB	0 B	0.00%	✅
Rum Profiler	4.31 KiB	4.31 KiB	0 B	0.00%	✅
Rum Recorder	24.54 KiB	24.54 KiB	0 B	0.00%	✅
Logs	56.25 KiB	56.25 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	124.88 KiB	124.88 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld

[jorgetomtz]

Actually this should be moved to buildkit but no write access:

tags: ["arch:amd64"]
image: registry.ddbuild.io/images/docker:27.3.1
script:
  - docker buildx build --platform linux/amd64 --build-arg CHROME_PACKAGE_VERSION=$CHROME_PACKAGE_VERSION --tag $CI_IMAGE --push .

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Overall Coverage: 77.25%

View detailed report

_{This comment will be updated automatically if new data arrives.
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