SSDM-4331: createPlugins and getPlugins implemented and test in Java and JS

...1/as/webapps/openbis-v3-api-test/html/test/test-delete.js

...1/as/webapps/openbis-v3-api-test/html/test/test-search.js

...-plugins/tests/1/dss/reporting-plugins/js-test/js-test.py

js-test/servers/common/openBIS-server/etc/capabilities

openbis/etc/capabilities

...r/asapi/v3/executor/deletion/ConfirmDeletionExecutor.java

.../executor/deletion/ConfirmDeletionsOperationExecutor.java

...i/v3/executor/deletion/DeletionAuthorizationExecutor.java

.../asapi/v3/executor/deletion/IConfirmDeletionExecutor.java

.../v3/executor/deletion/IDeletionAuthorizationExecutor.java

...er/asapi/v3/executor/deletion/SearchDeletionExecutor.java

.../generic/server/asapi/v3/helper/generators/Generator.java

...rver/asapi/v3/translator/deletion/DeletionTranslator.java

...enbis/public/resources/api/v3/as/dto/deletion/Deletion.js

...i/v3/as/dto/deletion/confirm/ConfirmDeletionsOperation.js

...sis/openbis/systemtest/asapi/v3/AbstractDeletionTest.java

...ch/ethz/sis/openbis/systemtest/asapi/v3/AbstractTest.java

.../sis/openbis/systemtest/asapi/v3/ConfirmDeletionTest.java

...z/sis/openbis/systemtest/asapi/v3/SearchDeletionTest.java

...z/sis/openbis/generic/asapi/v3/dto/deletion/Deletion.java