Set tests.security.manager flag to false in integTestRemote task

[martin-gaievski]

Signed-off-by: Martin Gaievski [email protected]

Description

Currently default command for running integTests doesn't work because core OS can't set security manager properly. This happens for the plugin while setting read-only property that has been already set for core OS

 Caused by:
        java.lang.IllegalStateException: codebase property already set: codebase.opensearch-knn -> file:/Users/gaievski/dev/opensearch/k-NN/build/distributions/opensearch-knn-2.0.0.0-SNAPSHOT-test-fixtures.jar, cannot set to file:/Users/gaievski/dev/opensearch/k-NN/build/distributions/opensearch-knn-2.0.0.0-SNAPSHOT.jar
            at org.opensearch.bootstrap.Security.readPolicy(Security.java:248)
            at org.opensearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:161)

All our test related gradle tasks except for integTestRemote defaulted security.manager flag to false, example. With this change I'm doing the same for integTestRemote so mentioned commands for release checks can work properly. Flag still can be set to true if required, we just changing default value.

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