perf(spec-parser): improve only keeping 5 adaptive card elements

[SLdragon]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.94%. Comparing base (dc2ed64) to head (d02ea4c).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #12575      +/-   ##
==========================================
+ Coverage   89.93%   89.94%   +0.01%     
==========================================
  Files         571      571              
  Lines       33747    33787      +40     
  Branches     6565     6631      +66     
==========================================
+ Hits        30349    30390      +41     
  Misses       1495     1495              
+ Partials     1903     1902       -1     

Files with missing lines	Coverage Δ
.../fx-core/src/component/generator/apiSpec/helper.ts	93.69% <100.00%> (ø)
packages/spec-parser/src/adaptiveCardGenerator.ts	97.56% <100.00%> (+0.22%)	⬆️
packages/spec-parser/src/manifestUpdater.ts	94.28% <100.00%> (-0.03%)	⬇️
packages/spec-parser/src/utils.ts	94.49% <ø> (-0.31%)	⬇️

... and 2 files with indirect coverage changes