Adding 4 new test cases and a support for nss creation for gcp platform

[ypersky1980]

This PR handles requirements specified in #11129 and there are 4 new test cases which were added:

1. CLI NSS creation over Azure
2. CLI NSS creation over IBMCOS
3. CLI NSS creation over AWS
4. CLI NSS creation over GCP

In order to support creation of NSS over GCP a support was added to namespacestore.py.

[openshift-ci]

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[ocs-ci]

PR validation on existing cluster

Cluster Name: ypersky-vm10
Cluster Configuration:
PR Test Suite: tier1
PR Test Path: tests/functional/object/mcg/test_namespace_crd.py::TestNamespace::test_namespace_bucket_creation_crd[AWS-CLI-Single]
Additional Test Params:
OCP VERSION: 4.18
OCS VERSION: 4.18
tested against branch: master

Job PASSED.

[ocs-ci]

PR validation on existing cluster

Cluster Name: ypersky-vm10
Cluster Configuration:
PR Test Suite: tier1
PR Test Path: tests/functional/object/mcg/test_namespace_crd.py::TestNamespace::test_namespace_bucket_creation_crd[AZURE-CLI-Single]
Additional Test Params:
OCP VERSION: 4.18
OCS VERSION: 4.18
tested against branch: master

Job PASSED.

[ocs-ci]

PR validation on existing cluster

Cluster Name: ypersky-vm10
Cluster Configuration:
PR Test Suite: tier1
PR Test Path: tests/functional/object/mcg/test_namespace_crd.py::TestNamespace::test_namespace_bucket_creation_crd[IBM-CLI-Single]
Additional Test Params:
OCP VERSION: 4.18
OCS VERSION: 4.18
tested against branch: master

Job PASSED.

[ocs-ci]

PR validation on existing cluster

Cluster Name: ypersky-vm10
Cluster Configuration:
PR Test Suite: tier1
PR Test Path: tests/functional/object/mcg/test_namespace_crd.py::TestNamespace::test_namespace_bucket_creation_crd[GCP-CLI-Single]
Additional Test Params:
OCP VERSION: 4.18
OCS VERSION: 4.18
tested against branch: master

Job PASSED.

[sagihirshfeld]

Please remove the newly added on_prem_platform_required marks since they will cause a skip of these tests when they shouldn't. This is only applicable for RGW-OC-Single and RGW-CLI-Single.