RD-5756 Migrate `shared` components to TypeScript - part 2

[qooban]

Description

Second and final part of RD-5756, that was started in https://github.com/cloudify-cosmo/cloudify-stage/pull/2297.

In this PR the main two files from app/components/shared that were migrated are:

1. widgets/PageContent.tsx
2. widgets/Widget.tsx

To make the migration smoother WidgetDynamicContent component was also migrated.

Screenshots / Videos

N/A

Checklist

• [x] My code follows the UI Code Style.
• [ ] I followed the UI Testing Guidelines and verified that all tests/checks have passed.
• [x] I verified if that change requires any update in the documentation.
• [x] I added proper labels to this PR.

Tests

- in progress...

Documentation

N/A