test: replace apmsoak with the one in apm-perf

[kruskall]

Motivation/summary

update docs to reference apmsoak binary in apm-perf

remove custom apmsoak package in systemtest module

update soaktest_workers terraform module to use new apmsoak

update apmsoak folder readme and remove section about deleted apmsoak terraform module

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

Closes #11698

[github-actions]

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[mergify]

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

• backport-7.17 is the label to automatically backport to the 7.17 branch.
• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-9./d is the label to automatically backport to the 9./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.

[carsonip]

thanks, the diff looks reasonable. Have you tested it by running the new tf?

[kruskall]

Tested and works fine! 👍

[carsonip]

lgtm thanks for testing