Fix cloned phase-viewers when deleting/renaming an ephemeris component

[kecnry]

Previously cloned phase-viewers (introduced in #74, not yet in a release) were not updated (renamed or removed) when an ephemeris component was renamed. This PR updates the ephemeris plugin to be aware that there may be multiple phase-viewers corresponding to the ephemeris, and treats the "first" as the default when assigning defaults based on axes limits, etc.

(ignore the crashing time plot - too many notebooks running at once)

Screen.Recording.2024-02-23.at.2.26.45.PM.mov

devdeps failure is likely because of jdaviz, but we are still pinned to jdaviz 3.8 (and those tests are passing). See #92 and #68.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.18%. Comparing base (ca0efe9) to head (26fc524).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   93.92%   94.18%   +0.26%     
==========================================
  Files          35       35              
  Lines        1547     1548       +1     
==========================================
+ Hits         1453     1458       +5     
+ Misses         94       90       -4     

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[rosteen]

I tested the behavior on main and with this, definitely looks better now.