Apply ShadowSpatialSpectral mark object when applicable

[Jdaviz-Triage-Bot]

Reporter: Jesse Averbukh

This continues work described in 

• Generalize handling of composite subsets when determining subset type v2 #2266 (comment)
  • The work flow of number 1
• Generalize handling of composite subsets when determining subset type v2 #2266 (comment)
  • Handle case where the user removes collapsed cube data from the spectrum viewer

This may involve rethinking how we handle ShadowSpatialSpectral marks (the overlap between collapsed spatial subsets and spectral subsets in the spectrum viewer of cubeviz) so this ticket should include that discussion.

---

DISCLAIMER: This issue was autocreated by the Jdaviz Issue Creation Bot on behalf of the reporter. If any information is incorrect, please contact Duy Nguyen