include qc report in a separate step

[zsigmas]

I have created an alternative workflow where test and qc happen in separate steps.

The workflow runs all the steps as before with the following differences:

• Check does no longer run the tests
• test step also creates the validation report. This report is uploaded as an artifact in the test step.
• pkgdown step waits for the tests to run, then it downloads the test report artifact and creates the documentation.

This PR does not address including the qc in the templates repo instead of the package repo. A different PR can be done for that issue.

• Do not mind the repo and branch names in the workflow when ready to merge I will fix them.

[sorinvoicu]

LGTM 🚀 , assuming we (still) want to keep the qc report bulk of code in each repo. (?)

[zsigmas]

I will fix the routes of the jobs and merge it. Extracting the QC report we can do in a following iteration. Thanks!