[8.19] Fix getBytesRef in ConstantBytesRefVector (#136445) #136455
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We should not return the BytesRef directly from ConstantBytesRefBlock, but instead copy its slice to a scratch buffer. Although current usage does not modify the offset and length, the contract should allow callers to change these fields, as long as the content of the bytes array remains unchanged. The usage pattern below should be fine, but currently it can change ConstantBytesRefBlock.
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Backports the following commits to 8.19: