Desensitize logs for store/tikv

[kolbe]

Feature Request

Is your feature request related to a problem? Please describe:

The tidb_log_desensitization variable added in #18566 should also cause message emitted by the tikv store code in TiDB to be desensitized.

Describe the feature you'd like:

In numerous locations of store/tikv/, sensitive data could be logged. For example, store/tikv/prewrite.go:168:

		for _, keyErr := range keyErrs {
			// Check already exists error
			if alreadyExist := keyErr.GetAlreadyExist(); alreadyExist != nil {
				key := alreadyExist.GetKey()
				return c.extractKeyExistsErr(key)
			}

			// Extract lock from key error
			lock, err1 := extractLockFromKeyErr(keyErr)
			if err1 != nil {
				return errors.Trace(err1)
			}
			logutil.BgLogger().Info("prewrite encounters lock",
				zap.Uint64("conn", c.connID),
				zap.Stringer("lock", lock))
			locks = append(locks, lock)
		}

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: