SSDM-2130 : V3 AS API - finish up js tests - refactoring

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

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

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

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

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

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

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

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

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