Cannot read properties of undefined (reading 'component') while loading Elemental

[aalves08]

Summary

Fixes #11414

Occurred changes and/or fixed issues

• make sure we are adding the machine config to the subTypes array so that it is available while creating/editing an Elemental cluster

Technical notes summary

The problem lies with the edit view of provisioning.cattle.io.cluster where if the preferred provisioner (RKE1 or RKE2 - toggle on cluster creation screen, which is persistent) would omit the machine config for Elemental clusters if it was toggled for RKE1. This PR makes it available always in a scenario where a subType has been selected, which will cover the create/edit Elemental cluster direct links.

Areas or cases that should be tested

1. Add the elemental-ui repo to local cluster -> apps -> repositories:
   type git
   url: https://github.com/rancher/elemental-ui
   branch: gh-pages
2. Install Elemental version 1.3.1-rc7 (only published version compliant with Rancher 2.9)
3. Start elemental locally (install extension and operator + crds)
4. Go to cluster management -> hit create -> toggle the rke indicator to rke1
5. Go to Create Elemental cluster (via Elemental extension -> dashboard -> button Create Elemental Cluster
6. Make sure interface loads fine and that cluster creation succeeds
7. Go to cluster management and edit the Elemental cluster
8. Make sure interface loads fine and that cluster edit succeeds

Areas which could experience regressions

Screenshot/Video

Checklist

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[mantis-toboggan-md]

LGTM

[eva-vashkevich]

Tried creating and editing RKE1, RKE2 and Elemental