qiskit/releasenotes/notes/0.23/fix-vqe-default-batching-eb...

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fixes:
- |
Fixed a performance bug where the new primitive-based variational algorithms
:class:`.minimum_eigensolvers.VQE`, :class:`.eigensolvers.VQD` and :class:`.SamplingVQE`
did not batch energy evaluations per default, which resulted in a significant slowdown
if a hardware backend was used.