Feat/remove auto disambiguation

[PieterOlivier]

This PR removes the automatic disambiguation of error trees when allowRecovery=true but allowAmbiguity=false.

Note that in this case a separate check is needed for 'regular' ambiguities (which are not allowed).

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 16 lines in your changes missing coverage. Please review.

Project coverage is 49%. Comparing base (415773f) to head (40b1226).

Files with missing lines	Patch %	Lines
src/org/rascalmpl/library/util/ErrorRecovery.java	40%	6 Missing and 6 partials ⚠️
...rc/org/rascalmpl/semantics/dynamic/Expression.java	0%	2 Missing ⚠️
...g/rascalmpl/values/RascalFunctionValueFactory.java	0%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             feat/error-recovery   #2075   +/-   ##
=====================================================
  Coverage                     49%     49%           
- Complexity                  6605    6607    +2     
=====================================================
  Files                        685     685           
  Lines                      61148   61152    +4     
  Branches                    8850    8852    +2     
=====================================================
+ Hits                       30239   30244    +5     
+ Misses                     28706   28701    -5     
- Partials                    2203    2207    +4     

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