Fix normalized hash test in case of collisions.

[toinehartman]

Allow normalized hash collisions in tests in case there would be a hash collision for the input strings anyway.

Example failure:
https://github.com/usethesource/rascal/actions/runs/32944398075/job/98103370299

rascal>import IO;
ok
rascal>str1 = "𠙹𠟒𒇇𠢆𒑡𡓅𒌓";
str: "��������������"
───
𠙹𠟒𒇇𠢆𒑡𡓅𒌓
───

rascal>str2 = "𠌰𒄇𒑃𒎔𒉱𠤿𠙨";
str: "��������������"
───
𠌰𒄇𒑃𒎔𒉱𠤿𠙨
───

rascal>md5Hash(str1) == md5Hash(str2);
bool: true

Fixes test added in:

• OS independent logical locs #2644

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46%. Comparing base (16abf95) to head (197225b).

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2870   +/-   ##
=======================================
- Coverage       46%     46%   -1%     
+ Complexity    6776    6768    -8     
=======================================
  Files          844     844           
  Lines        67103   67103           
  Branches     10022   10022           
=======================================
- Hits         30903   30884   -19     
- Misses       33828   33842   +14     
- Partials      2372    2377    +5     

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[DavyLandman]

ouch, our random test actually found a md5 hash collision?

[toinehartman]

Exactly! But the test was formulated in a way that never allowed collisions of the 'normalized' hash. Now we allow a 'normalized' has collision whenever there would be a collision on the raw strings.