CLI: Remove bluebird config

[medikoo]

Fix regression, accidentally introduced with #8726 and exposed in integration tests run: https://github.com/serverless/serverless/runs/1669093528

Bluebird long stack trace config was moved after the point where eventual bluebird promises are created, and that's not allowed (observable only with SLS_DEBUG=1)

I decided to remove the config completely as we already migrated some parts from bluebird, so this functionality for sure no longer covers all async spans, and we're about to ditch bluebird with #7171

[codecov]

Codecov Report

Merging #8732 (f4dd9a2) into master (847fa34) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8732   +/-   ##
=======================================
  Coverage   87.43%   87.43%           
=======================================
  Files         256      256           
  Lines        9631     9631           
=======================================
  Hits         8421     8421           
  Misses       1210     1210           

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[pgrzesik]

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