Make endpoint_string one line for ccr test

[peterzhuamazon]

Description

Make endpoint_string one line for ccr test

On Windows, it could not able to handle multi-line parameters well like on *nix system through bash.exe.

Therefore, we will group the entire json into one line.

https://ci.opensearch.org/ci/dbc/integ-test/2.15.0/9992/windows/x64/zip/test-results/[…]nteg-test/cross-cluster-replication/with-security/stderr.txt

https://ci.opensearch.org/ci/dbc/integ-test/2.15.0/9992/windows/x64/zip/test-results/[…]nteg-test/cross-cluster-replication/with-security/stdout.txt

https://build.ci.opensearch.org/blue/rest/organizations/jenkins/pipelines/integ-test/runs/8299/nodes/112/steps/500/log/?start=0

Thanks.

Issues Resolved

#4681
opensearch-project/cross-cluster-replication#1395

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[peterzhuamazon]

This PR can be reverted now:

• [Backport 2.15] Fixing integTestRemote for windows setup cross-cluster-replication#1404

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.05%. Comparing base (a5a3d6d) to head (a94e293).
Report is 13 commits behind head on main.

Files	Patch %	Lines
...workflow/integ_test/integ_test_suite_opensearch.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4794   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files         193      193           
  Lines        6416     6416           
=======================================
  Hits         5906     5906           
  Misses        510      510           

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