Enable running builds with alternative PHENIO

[caufieldjh]

Re: conversation with @matentzn on April 1:
We would like to be able to use alternative versions of PHENIO in automate-pheno-comparisons for evaluation, e.g., PHENIO with development version of Upheno.
These should be run in a manner identical to that as that in the current Jenkins pipeline, with the following modifications:

• Provide a flag to use an alternative PHENIO source.
• If the flag is set, retrieve the alternative PHENIO from a specified URL.
  This URL will need to point to a gzipped semsql version of PHENIO, identical in format to that of https://s3.amazonaws.com/bbop-sqlite/phenio.db.gz .
  The alternative PHENIO version will need to have its own versionIRI distinct from that of the "production" build.
• Upload the results to KG-Hub in their own directory, named using the versionIRI.

[matentzn]

Yes, great. The "flag" and the URL could be one and the same, some if env['PHENIO_URL'] is set, use that version, else proceed as usual

[caufieldjh]

I'm leaning toward using an explicit flag just to make it very clear what is being done, and so the alternate URL can be set without directly impacting the production build.