Fix GROUP BY optimizations on operations with LIMIT/OFFSET

[RobinTF]

Fixes #2465, this PR is similar in nature to #2404 when it comes to the symptoms, but is a completely different root cause.
Basically several GROUP BY optimisations did completely ignore previous LIMIT or OFFSET clauses. This is now either fixed by correctly handling these clauses or by disabling the optimisations for these cases.

Affected queries include:

SELECT ?x (COUNT(?x) AS ?count) WHERE {
  {
    SELECT * {
      ?x ?y ?z
    }
    OFFSET 1
    LIMIT 12
  }
}
GROUP BY ?x

SELECT ?y (COUNT(?y) AS ?count) WHERE {
  {
    SELECT * {
      ?x a ?y
    }
    OFFSET 1
    LIMIT 100
  }
}
GROUP BY ?y

[sparql-conformance]

Overview

Number of Tests	Passed ✅	Failed ❌	Intended ⚠️	Not tested
525	439	19	67	0

Conformance check passed ✅

No test result changes.

Details: https://qlever.dev/sparql-conformance-ui?cur=5340eeeb7274dce96dc1f543428451799c640f45&prev=a8c9d865aac01c673ffa3b56758a12dbb94f7676

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.11%. Comparing base (a8c9d86) to head (5340eee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2484      +/-   ##
==========================================
+ Coverage   91.09%   91.11%   +0.01%     
==========================================
  Files         465      465              
  Lines       39690    39719      +29     
  Branches     5312     5317       +5     
==========================================
+ Hits        36155    36189      +34     
+ Misses       2020     2019       -1     
+ Partials     1515     1511       -4     

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[sonarqubecloud]

Quality Gate passed

Issues
5 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