SNOW-1672654 Support for empty encryptionMaterial

[sfc-gh-dstempniak]

Description

If an internal stage is created with SNOWLFAKE_SSE encryption, encryptionMaterial isn't returned from Snowflake. We need to support empty encryptionMaterial when client side encryption is disabled and isClientSideEncrypted is false.

Checklist

• [x] Code compiles correctly
• [x] Code is formatted according to Coding Conventions
• [x] Created tests which fail without the change (if possible)
• [x] All tests passing (dotnet test)
• [ ] Extended the README / documentation, if necessary
• [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.28%. Comparing base (5e16693) to head (ee08529).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1048 +/- ## ========================================== + Coverage 86.11% 86.28% +0.16% ========================================== Files 120 120 Lines 11628 11648 +20 Branches 1167 1174 +7 ========================================== + Hits 10013 10050 +37 + Misses 1332 1318 -14 + Partials 283 280 -3 ```

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