Add additional cluster config support in OSD integTest

[peterzhuamazon]

Description

Add additional cluster config support in OSD integTest

Issues Resolved

#3589 partially
#3434

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[rishabh6788]

LGTM.
If we have tests for LocalTestClusterOpenSearchDashboards can you add a test case for self.additional_cluster_config parameter being passed.

[codecov]

Codecov Report

Merging #3590 (1c82aa2) into main (a70172d) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #3590      +/-   ##
==========================================
- Coverage   91.48%   91.45%   -0.04%     
==========================================
  Files         181      181              
  Lines        5369     5373       +4     
==========================================
+ Hits         4912     4914       +2     
- Misses        457      459       +2     

Impacted Files	Coverage Δ
...teg_test/integ_test_suite_opensearch_dashboards.py	92.42% <33.33%> (-2.82%)	⬇️
...rkflow/integ_test/service_opensearch_dashboards.py	96.82% <100.00%> (+0.05%)	⬆️

[peterzhuamazon]

LGTM. If we have tests for LocalTestClusterOpenSearchDashboards can you add a test case for self.additional_cluster_config parameter being passed.

Added test.
Thanks.