Fix MY handler regression

[ppinchuk]

If user defines "dsets" in MY collection config as a subset of all possible dsets, then some required LCOE dsets may end up missing from the output (i.e. not added to pass_through_dsets). In this PR, we pull the full set of available datasets regardless of the user input. Includes test.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.60%. Comparing base (df1eee5) to head (8c443a8).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
reV/handlers/multi_year.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
+ Coverage   87.52%   87.60%   +0.07%     
==========================================
  Files         122      122              
  Lines       18183    18218      +35     
==========================================
+ Hits        15915    15960      +45     
+ Misses       2268     2258      -10     

Flag	Coverage Δ
unittests	87.60% <96.00%> (+0.07%)	⬆️

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[ppinchuk]

reVX test fails because of pandas 2.0. Moving forward with this for now