fix(app) disable configurations when entity creation is blocked [WD-7489]

[mas-who]

Done

• Fixed the issue with configuration side navigation items remaining accessible even when entity creation (i.e. instance, network, profile or storage volume) is blocked due to invalid form entries.

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @lorumic or @edlerd for access.
   • With a local copy of this branch, run as described here.
2. Perform the following QA steps:
   • While creating an instance, select a base image so that configurations becomes available. Click on the Advanced drop down, then deselect the base image. The drop down should collapse and become disabled.
   • While creating a profile, enter a name for the profile so that configurations becomes available. Click on the Advanced drop down, then clear the profile name input field. The drop down should collapse and become disabled.
   • While creating a network, enter a name for the network so that configurations becomes available. Click on the Advanced drop down, then clear the network name input field. The drop down should collapse and become disabled.
   • While creating a storage volume, enter a name for the volume so that configurations becomes available. Click on the Advanced drop down, then clear the volume name input field. The drop down should collapse and become disabled.

[webteam-app]

Demo starting at https://lxd-ui-578.demos.haus

[edlerd]

LGTM, thanks for fixing this.