perf(spec-parser): use summary for converation starter and truncate it with 50 chars

[SLdragon]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.83%. Comparing base (8fbe2bc) to head (80b41d4).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #11474    +/-   ##
========================================
  Coverage   87.83%   87.83%            
========================================
  Files         496      496            
  Lines       29732    29735     +3     
  Branches     5944     5792   -152     
========================================
+ Hits        26114    26117     +3     
  Misses       1778     1778            
  Partials     1840     1840            

Files	Coverage Δ
packages/spec-parser/src/constants.ts	100.00% <100.00%> (ø)
packages/spec-parser/src/manifestUpdater.ts	93.17% <100.00%> (+0.06%)	⬆️