feat: add latest-adopted maturity to impact analysis endpoint

[richardzilincikPantheon]

After reviewing the relevant frontend code, I found a way of doing this that wouldn't require frontend changes. This removes the change from #716.

[codecov[bot]]

Codecov Report

Merging #717 (a8176b1) into develop (549112e) will decrease coverage by 0.02%. The diff coverage is 0.00%.

:exclamation: Current head a8176b1 differs from pull request most recent head d09ba0d. Consider uploading reports for the commit d09ba0d to get more accurate results

@@             Coverage Diff             @@
##           develop     #717      +/-   ##
===========================================
- Coverage    78.10%   78.09%   -0.02%     
===========================================
  Files          112      112              
  Lines        12693    12695       +2     
===========================================
  Hits          9914     9914              
- Misses        2779     2781       +2     

Impacted Files	Coverage Δ
api/views/yangSearch/yangSearch.py	14.57% <0.00%> (-0.07%)	:arrow_down: