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 36.36364% with 14 lines in your changes missing coverage. Please review.

Project coverage is 49%. Comparing base (79be4a0) to head (40b1226).
Report is 109 commits behind head on feat/error-recovery.

Files with missing lines	Patch %	Lines
src/org/rascalmpl/library/util/ErrorRecovery.java	40%	6 Missing and 6 partials ⚠️
...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%   -1%     
+ Complexity                  6610    6607    -3     
=====================================================
  Files                        685     685           
  Lines                      61145   61152    +7     
  Branches                    8850    8852    +2     
=====================================================
- Hits                       30253   30244    -9     
- Misses                     28691   28701   +10     
- Partials                    2201    2207    +6     

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