chore(repo): enable plugin isolation and bump nx

[AgentEnder]

Enables plugin isolation for practical testing on Nx console
Updates Nx to 19.4.0 RC's s.t. it has the bug fixes that are relevant.

[nx-cloud]

☁️ Nx Cloud Report

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✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-local --configuration=ci --exclude=nx-console --parallel=1
• nx affected --targets=lint,test,build --configuration=ci --exclude=nx-console --parallel=1
• nx-cloud record -- ./gradlew ktfmtCheck
• nx-cloud record -- npx nx format:check
• nx affected --targets=build,test --configuration=ci --exclude=nx-console --parallel=1
• nx run intellij:build --info

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[MaxKless]

closing in favor of #2197