HPCC-31300 Clean up roxie metric code

[ghalliday]

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[github-actions]

https://track.hpccsystems.com/browse/HPCC-31300
Jira updated

[ghalliday]

@richardkchapman dead code elimination - split into 2 commits to clarify when reviewing

[richardkchapman]

Not sure what you are trying to achieve here. If the intention was to remove all the "per second" roxie metrics, you should have removed more code. If you just wanted to eliminate the unused "dumpMetrics" function then you should have left in place the timer stuff. As it stands I think the "per second" metrics are still added to Roxie's list of metrics that get returned via control:metrics, but won't work properly

[richardkchapman]

See comment in conversation

[richardkchapman]

See #18353

[ghalliday]

Superseded by Richards's PR