studio: declare host-provided libs as peerDependencies

[dpfaffenbauer]

Summary

• Move react, react-dom, antd, immer, @reduxjs/toolkit, react-redux and @pimcore/studio-ui-bundle from dependencies to peerDependencies in all 23 studio bundle package.jsons.
• These libs are shared by the Pimcore Studio host via Module Federation, so the bundles should declare them as peers rather than direct deps.
• Side effect: Dependabot stops proposing major bumps (e.g. react 19, antd 6, immer 11) that pimcore studio-ui-bundle doesn't support.
• Replace 2 trivial isNil usages from lodash with value == null so lodash doesn't need to be declared as a dep/peer.

Test plan

• npm install clean
• npm run check-types --workspaces --if-present
• npm run build
• Studio UI loads (order state cell + relation field still render correctly)

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud