Remove deprecated package @babel/plugin-proposal-private-property-in-object

[ramondeklein]

NPM package auditing resulted in the following message:

└─ @babel/plugin-proposal-private-property-in-object
   ├─ ID: @babel/plugin-proposal-private-property-in-object (deprecation)
   ├─ Issue: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-private-property-in-object instead.
   ├─ Severity: moderate
   ├─ Vulnerable Versions: 7.21.11
   │ 
   ├─ Tree Versions
   │  └─ 7.21.11
   │ 
   └─ Dependents
      └─ web-app@workspace:.

We should probably move to the @babel/plugin-transform-private-property-in-object package.

When this issue is implemented then --ignore '@babel/plugin-proposal-private-property-in-object (deprecation)' should be removed from ui,yaml.