Fix wrong number of host in mdm solutions modal and fix mdm solutions table UI to for null named solutions

[ghernandez345]

relates to #16837, #17334, #17335

This fixes a UI bug for the case where the mdm solution name can be null. We now handle this case properly and show the mdm solution data in the modal.

This also fixes a UI bug where we showed the incorrect number of hosts in the mdm solutions modal.

There is various cleanup here to the js and scss code in this PR too.

• [x] Added/updated tests
• [x] Manual QA for all new/changed functionality

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.48%. Comparing base (2d1caa8) to head (7ae4041).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17336   +/-   ##
=======================================
  Coverage   65.48%   65.48%           
=======================================
  Files        1190     1190           
  Lines      106956   106958    +2     
  Branches     2569     2572    +3     
=======================================
+ Hits        70039    70041    +2     
  Misses      31581    31581           
  Partials     5336     5336           

Flag	Coverage Δ
frontend	52.05% <100.00%> (+0.01%)	:arrow_up:

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[ghernandez345]

@gillespi314 I'll make another PR to address your comments so I can get this fix in before freeze. Thanks for the review!