Don't use the deprecated fields in ToolchainCluster.Spec

[metlos]

Update to the streamlined version of ToolchainCluster and fix the register member tests to take the new version and workflows into account.

Related PRs:

• api: https://github.com/codeready-toolchain/api/pull/448
• host-operator: https://github.com/codeready-toolchain/host-operator/pull/1094
• member-operator: https://github.com/codeready-toolchain/member-operator/pull/602
• registration-service: https://github.com/codeready-toolchain/registration-service/pull/474
• toolchain-e2e: https://github.com/codeready-toolchain/toolchain-e2e/pull/1054
• ksctl: https://github.com/kubesaw/ksctl/pull/84

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.57%. Comparing base (bd2bf12) to head (9e008d9). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #84 +/- ## ========================================== - Coverage 69.66% 69.57% -0.09% ========================================== Files 43 43 Lines 2571 2564 -7 ========================================== - Hits 1791 1784 -7 Misses 589 589 Partials 191 191 ``` | [Files with missing lines](https://app.codecov.io/gh/kubesaw/ksctl/pull/84?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubesaw) | Coverage Δ | | |---|---|---| | [pkg/cmd/adm/register\_member.go](https://app.codecov.io/gh/kubesaw/ksctl/pull/84?src=pr&el=tree&filepath=pkg%2Fcmd%2Fadm%2Fregister_member.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubesaw#diff-cGtnL2NtZC9hZG0vcmVnaXN0ZXJfbWVtYmVyLmdv) | `75.00% <100.00%> (-0.60%)` | :arrow_down: |