Prevent memory allocation errors because of caching for lazy results

[RobinTF]

Currently, when consuming a lazy result up to a point the code tries to prepare it for the cache. If during preparation we run out of memory this should not prevent the operation from running, it should just discard the value kept for the cache.

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=a4ece67cfdfbdb3a1f9b358ac1e0f80520dbcf32&prev=c70d5e9def26e143d4d62b1b98405395e281b081

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.98%. Comparing base (aec57fe) to head (a4ece67).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1578   +/-   ##
=======================================
  Coverage   88.98%   88.98%           
=======================================
  Files         368      368           
  Lines       33825    33864   +39     
  Branches     3827     3828    +1     
=======================================
+ Hits        30098    30135   +37     
  Misses       2473     2473           
- Partials     1254     1256    +2     

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