Enforce unique benchmark names

[pavoljuhas]

Benchmark results are stored in BigQuery under the pytest function
name rather than a full pytest ID. Here we ensure that future
benchmarks will not add overlapping function names.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (e0b54ff) to head (6eab64a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8279   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files        1122     1122           
  Lines      102598   102598           
=======================================
  Hits       102182   102182           
  Misses        416      416           

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[pavoljuhas]

On another check, the BigQuery in fact stores full benchmark names. This is not needed.