Add workflow.report config scopes

[bentsherman]

This PR adds the workflow.report config scope as a replacement for the existing report scopes:

• dag -> workflow.report.dag
• report -> workflow.report.execution
• timeline -> workflow.report.timeline
• trace -> workflow.report.trace

The config settings are otherwise identical, except that the file option is resolved against the workflow output directory instead of the launch directory.

This makes the standard reports easier to use with workflow outputs.

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[pditommaso]

Could this impact any Platform capabilities? just wondering and better e2e testing

[bentsherman]

It shouldn't break platform runs that use the existing report options, since this PR falls back to them if workflow.report is not used

For platform runs that use the new workflow.report options, you will need to make sure to set the output directory. Right now you can only do that in config, but I think they are working to add an "Output directory" field