MGMT-14936: Remove user-managed-networking cluster attribute

[ammont82]

Related to https://issues.redhat.com/browse/MGMT-14936

1. For vsphere + umn/cmn we can save it in the state API that we have, If the user already set VIPs we know that he uses CMN

2. We use these feature support levels: 'CLUSTER_MANAGED_NETWORKING', 'USER_MANAGED_NETWORKING'

   CLUSTER_MANAGED_NETWORKING	USER_MANAGED_NETWORKING	Option selected by default
   Supported	Unsupported	CMN
   Supported	Supported	CMN
   Unsupported	Supported	UMN

3. If the platform is none or baremetal UI needs to update the platform accordingly:

   • Choosing CMN will patch the cluster using: cluster.platform.type = "baremetal"
   • Choosing CMN will patch the cluster using: cluster.platform.type = "none"

[openshift-ci-robot]

@ammont82: This pull request references MGMT-14936 which is a valid jira issue.

In response to [this](https://github.com/openshift-assisted/assisted-installer-ui/pull/2360): >Related to https://issues.redhat.com/browse/MGMT-14936 > >1. For vsphere + umn/cmn we can save it in the state API that we have, If the user already set VIPs we know that he uses CMN >2. We use these feature support levels: 'CLUSTER_MANAGED_NETWORKING', 'USER_MANAGED_NETWORKING' > > > > > >

CLUSTER_MANAGED_NETWORKING	USER_MANAGED_NETWORKING	Option selected by default
Supported	Unsupported	CMN
Supported	Supported	CMN
Unsupported	Supported	UMN

> >3. If the platform is none or baremetal UI needs to update the platform accordingly: >- Choosing CMN will patch the cluster using: >cluster.platform.type = "baremetal" >- Choosing CMN will patch the cluster using: >cluster.platform.type = "none" > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[jkilzi]

please rebase

[openshift-ci-robot]

@ammont82: This pull request references MGMT-14936 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.15.0" version, but no target version was set.

In response to [this](https://github.com/openshift-assisted/assisted-installer-ui/pull/2360): >Related to https://issues.redhat.com/browse/MGMT-14936 > >1. For vsphere + umn/cmn we can save it in the state API that we have, If the user already set VIPs we know that he uses CMN >2. We use these feature support levels: 'CLUSTER_MANAGED_NETWORKING', 'USER_MANAGED_NETWORKING' > > > > > >

CLUSTER_MANAGED_NETWORKING	USER_MANAGED_NETWORKING	Option selected by default
Supported	Unsupported	CMN
Supported	Supported	CMN
Unsupported	Supported	UMN

> >3. If the platform is none or baremetal UI needs to update the platform accordingly: >- Choosing CMN will patch the cluster using: >cluster.platform.type = "baremetal" >- Choosing CMN will patch the cluster using: >cluster.platform.type = "none" > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ammont82, jgyselov, jkilzi

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/openshift-assisted/assisted-installer-ui/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.

[openshift-ci-robot]

@ammont82: This pull request references MGMT-14936 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.15.0" version, but no target version was set.

In response to [this](https://github.com/openshift-assisted/assisted-installer-ui/pull/2360): >Related to https://issues.redhat.com/browse/MGMT-14936 > >1. For vsphere + umn/cmn we can save it in the state API that we have, If the user already set VIPs we know that he uses CMN >2. We use these feature support levels: 'CLUSTER_MANAGED_NETWORKING', 'USER_MANAGED_NETWORKING' > > > > > >

CLUSTER_MANAGED_NETWORKING	USER_MANAGED_NETWORKING	Option selected by default
Supported	Unsupported	CMN
Supported	Supported	CMN
Unsupported	Supported	UMN

> >3. If the platform is none or baremetal UI needs to update the platform accordingly: >- Choosing CMN will patch the cluster using: >cluster.platform.type = "baremetal" >- Choosing CMN will patch the cluster using: >cluster.platform.type = "none" > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.