DRIVERS-2302 add missing test setup step

[kevinAlbs]

Summary

• Insert key1Document in the keyvault.datakeys collection in the Explicit Encryption test setup.

Background & Motivation

Inserting key1Document was in the Go implementation but was missed when writing the setup steps.

Majority write concern must be used since the driver uses majority read concern to find key documents.

Please complete the following before merging:

• Bump spec version and last modified date. Not applicable? This is a test setup step fix
• Update changelog. Not applicable? This is a test setup step fix
• Make sure there are generated JSON files from the YAML test files. **Not applicable. Only affects prose tests. **
• Test changes in at least one language driver. Tested in Go and C
• Test these changes against all server versions and topologies (including standalone, replica set, sharded clusters, and serverless).