Disable CGO in cloudbeat binary

[moukoublen]

Summary of your changes

Screenshot/Data

Related Issues

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary README/documentation (if appropriate)

Introducing a new rule?

• Generate rule metadata using this script
• Add relevant unit tests
• Generate relevant rule templates using this script, and open a PR in elastic/packages/cloud_security_posture

[mergify]

This pull request does not have a backport label. Could you fix it @moukoublen? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[orouz]

🫡

[github-actions]

📊 Allure Report - 💚 No failures were reported.

Result	Count
🟥 Failed	0
🟩 Passed	359
⬜ Skipped	33

[moukoublen]

Comparison of sizes

Before cgo disablement

$ du -h build/golang-crossbuild/*
287M    build/golang-crossbuild/cloudbeat-linux-amd64
276M    build/golang-crossbuild/cloudbeat-linux-arm64

After cgo disablement

$ docker run \
  --rm --interactive --tty \
  --platform linux/arm64 \
  --entrypoint /bin/bash \
  docker.elastic.co/elastic-agent/elastic-agent-complete:8.15.0-SNAPSHOT \
    -c 'du -h $(dirname $(readlink $(which elastic-agent)))/components/cloudbeat'
    
208M	/usr/share/elastic-agent/data/elastic-agent-fa8549/components/cloudbeat

docker run \
  --rm --interactive --tty \
  --platform linux/amd64 \
  --entrypoint /bin/bash \
  docker.elastic.co/elastic-agent/elastic-agent-complete:8.15.0-SNAPSHOT \
    -c 'du -h $(dirname $(readlink $(which elastic-agent)))/components/cloudbeat'

218M	/usr/share/elastic-agent/data/elastic-agent-fa8549/components/cloudbeat

amd64: 287M => 218M
arm64: 276M => 208M