Enable sourcemaps for legible stack traces in lambdas

[lpsinger]

Fixes #2769.

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 6.11%. Comparing base (7312c55) to head (2c97c7f).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
app/email-incoming/circulars/index.ts	0.00%	1 Missing ⚠️
app/email-incoming/support/index.ts	0.00%	1 Missing ⚠️
app/scheduled/ads/index.ts	0.00%	1 Missing ⚠️
app/scheduled/circulars/index.ts	0.00%	1 Missing ⚠️
app/table-streams/circulars/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2770   +/-   ##
=====================================
  Coverage   6.10%   6.11%           
=====================================
  Files        168     168           
  Lines       4258    4270   +12     
  Branches     468     468           
=====================================
+ Hits         260     261    +1     
- Misses      3996    4007   +11     
  Partials       2       2           

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