Revert "refactor: replace x/exp usage with iterators"

[dliappis]

Reverting back to go 1.22 because goland crossbuild packaging fails on ARM with:

>> buildGoDaemon: Building for linux/arm64
Unable to find image 'docker.elastic.co/beats-dev/golang-crossbuild:1.23.6-arm' locally
1.23.6-arm: Pulling from beats-dev/golang-crossbuild
...
Status: Downloaded newer image for docker.elastic.co/beats-dev/golang-crossbuild:1.23.6-arm
exec /crossbuild: exec format error

Reverts #6933

[mergify]

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

• backport-./d./d is the label that automatically backports to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[dliappis]

Superseded by #6948

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube