HPCC-32932 Fix duplicate start time accumulation for if activity

[shamser]

Remove the start time tracking in CConditionalActivity as it is tracked in its derived activities.

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-32932

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[jakesmith]

@shamser - looks good.