Factor out more dbt YAML selectors

[jeancochrane]

In #373 we introduced a YAML selector in order to factor out a common node selection pattern that we use to run QC tests. We should factor out more of the node selection logic that we use in GitHub workflows so that everything is easier to reuse.

Note that since --selector overrides any behavior specified by other selection flags (issue context), we'll need to make use of YAML anchors and aliases in selectors.yml to make this code DRY.

Here are the patterns I think it would make sense to factor out:

• Select modified or new nodes only (source)
  • Factor out --select state:modified state:new into a selector called new_or_modified and assign it a YAML anchor with the same name
• Exclude QC tests (source)
  • Factor out --exclude tag:test_qc* into a new selector called exclude_qc_tests and assign it a YAML anchor with the same name
• Select modified or new nodes only, excluding QC tests (source)
  • Union new_or_modified and exclude_qc_tests as defined above
• Daily models (source 1 and source 2)
• Factor out --select tag:daily into a new selector called daily

[dfsnow]

@wagnerlmichael This one goes to you and I'll review/supervise.