Update Flixkit & Add Error Message for Missing Dependencies

[bthaile]

… dependencies

Closes #1424

Description

Update to use latest version of flixkit-go that does not have a dependency on flowkit.
Update to include core contracts allow with user defined contracts when generating a flix template.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.86957% with 27 lines in your changes missing coverage. Please review.

Project coverage is 28.55%. Comparing base (308f7f1) to head (ba7b9bb).

Files with missing lines	Patch %	Lines
internal/super/flix.go	62.96%	12 Missing and 8 partials ⚠️
internal/util/util.go	61.53%	5 Missing ⚠️
internal/dependencymanager/dependencyinstaller.go	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1852      +/-   ##
==========================================
+ Coverage   27.90%   28.55%   +0.64%     
==========================================
  Files          95       95              
  Lines        6482     6524      +42     
==========================================
+ Hits         1809     1863      +54     
+ Misses       4497     4479      -18     
- Partials      176      182       +6     

Flag	Coverage Δ
unittests	28.55% <60.86%> (+0.64%)	⬆️

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[bthaile]

closing, these changes get picked up on another PR