[Webview UI toolkit deprecation] AttachAcrToCluster, DraftDeployment/Dockerfile/Workflow Panel component removal

[tejhan]

This PR specifically removes elements from the AttachAcrToCluster & DraftDeployment/Dockerfile/Workflow commands.

.vsix for testing: vscode-aks-tools-1.6.0-deprecate3.vsix.zip

This is broken up as part of incremental PR's to make review & testing smoother.

For future reference:

• .secondary-button replaces VSCodeButton's appearance="secondary"
• .icon-button replaces VSCodeButton's appearance="icon"
• input[type="text"] replaces VSCodeTextInput
• input[type="checkbox"] replaces VSCodeCheckbox
• input[type="radio"] replaces VSCodeRadio
• Default "< hr >" element now has identical styling to VSCodeDivider
• Default "< a >" element also has identical styling to VSCodeLink

[ReinierCC]

AttachAcrToCluster worked well. ✅

For DraftDeployment after clicking create there's some text fields that don't get greyed out. As well the selected deployment option no longer appears.

Before:

After:

Similar Issue with Draft Dockerfile & Workflow