TEST: Ignore cache export error in conformance workflow

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.86%. Comparing base (1496059) to head (aa1cb89). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2799 +/- ## ======================================= Coverage 89.86% 89.86% ======================================= Files 107 107 Lines 10997 10997 Branches 50 50 ======================================= Hits 9883 9883 Misses 1054 1054 Partials 60 60 ```

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