MONGOCRYPT-937 restore prefixPreview and suffixPreview#1191
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Summary
Follow-up to #1184 to restore support for "prefixPreview" and "suffixPreview".
Details
Server 9.0-dev errors if trying to create a collection using
encryptedFieldswith "prefixPreview" or "suffixPreview":Servers 8.2 to pre-9.0 only support "prefixPreview" or "suffixPreview".
#1184 changed libmongocrypt to error if "prefixPreview" or "suffixPreview" was set as a query type for explicit encryption, or seen in the
encryptedFieldsfor auto encryption.To support pre-9.0 auto-encryption, an
encryptedFieldsspecifying "prefixPreview" and "suffixPreview" must not error in libmongocrypt to continue supporting pre-9.0 servers.To support pre-9.0 explicit-encryption, "prefix" and "suffix" query types can technically be used, since there is no difference in the resulting payload. But "prefixPreview" and "suffixPreview" is restored for consistency with the pre-8.0 server.
Motivation
This is intended to avoid dropping support for preview in drivers too early before a 9.0 stable release. Requested in this slack thread.
Testing
Changes in #1184 resulted in redundant explicit encryption tests testing "prefix" and "suffix" twice. The redundant tests are updated to test preview and the descriptions clarify if testing "(preview)" or "(stable)".