runtime: remove DisallowUnknownFields()

[johanbrandhorst]

This is now entirely controlled by the marshaller
options.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.82%. Comparing base (885c0bd) to head (12f0a6d).

Files with missing lines	Patch %	Lines
runtime/marshal_jsonpb.go	83.33%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #1386      +/-   ##
==========================================
- Coverage   58.87%   58.82%   -0.05%     
==========================================
  Files          32       32              
  Lines        3895     3891       -4     
==========================================
- Hits         2293     2289       -4     
  Misses       1349     1349              
  Partials      253      253              

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