Dryrun: Improve assembler error reporting

[jasonpaulos]

Summary

I know this code is not necessarily in heavy use anymore, but I had a frustrating experience debugging a pyteal integration test that uses dryrun.

If there's more than one assembler error in a TEAL dryrun source, dryrun returns the error directly from logic.AssembleString, which unhelpfully only tells you the number of errors:

go-algorand/data/transactions/logic/assembler.go

Line 2154 in 3a80a40

return fmt.Errorf("%d errors", l)

I fixed this by using the ReportMultipleErrors function to build a more informative string, like other callsites do.

Test Plan

Unit test added

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (3a80a40) 55.92% compared to head (57d654c) 55.93%.

Files	Patch %	Lines
daemon/algod/api/server/v2/dryrun.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5889   +/-   ##
=======================================
  Coverage   55.92%   55.93%           
=======================================
  Files         477      477           
  Lines       67432    67436    +4     
=======================================
+ Hits        37713    37718    +5     
+ Misses      27164    27163    -1     
  Partials     2555     2555           

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