HPCC-32780 Extend STD.System.Workunit.WorkunitMessages to return priority and cost

[shamser]

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Testing:

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-32780

Jirabot Action Result:
Workflow Transition To: Merge Pending

[ghalliday]

@shamser this is not backward compatible (if a previously compiled workunit is rerun on a new system without recompiling).

I think you need to

• define a new implementation function.
• pass a boolean into a shared implementation function to indicate whether the new fields should be added.
  See similar changes in fileservices.cpp plugin.

[ghalliday]

Change looks good. It could do with a regression test though - please add one in a separate jira (to avoid this pr being delayed) - so that we can check that the code compiles and runs...
Please squash.

[shamser]

Change looks good. It could do with a regression test though - please add one in a separate jira (to avoid this pr being delayed) - so that we can check that the code compiles and runs... Please squash.

Jira for regression test: https://hpccsystems.atlassian.net/browse/HPCC-33095

[github-actions]

Jirabot Action Result:
Added fix version: 9.10.0
Workflow Transition: 'Resolve issue'