Update sql dummy master key for testing

[penghuo]

Description

Added new datasources master key config required for datasource APIs.

Issues Resolved

opensearch-project/sql#2082

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #4007 (deef1e4) into main (84c3ba1) will not change coverage.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4007   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files         187      187           
  Lines        5673     5673           
=======================================
  Hits         5223     5223           
  Misses        450      450           

[gaiksaya]

Hi @penghuo Can you also update other test manifest? https://github.com/opensearch-project/opensearch-build/blob/main/manifests/2.10.0/opensearch-2.10.0-test.yml

Please ignore looks like it is already present there

Thanks!