Update Node to the latest LTS version

[budnix]

Context

The PR updates the monorepo to work with Node 20 (upcoming LTS).

Changes:

• Update all GitHub workflow flows to use Node 20;
• Remove all Node experimental flags;
• Fix eslint complaints about import orders;
• Update Docs about custom builds (update required Node version);
• Add export NODE_OPTIONS=--openssl-legacy-provider; Node option for all packages that use old Webpack 4 underneath. Otherwise, the Webpack throws an error after trying to build something (the latest supported Node is 16);
• Remove Angular Next from examples;
• Fix configuration that causes the Angular wrapper tests to fail;

How has this been tested?

• I tested the changes locally using Node 20.5.1 (npm 9.8.0);
• I triggered GH code examples with success (run);
• I triggered Docs staging deployment using Node 20, and the flow ended with success (run);
• I triggered flow that checks the monorepo packages in different OSs with success (run);
• I triggered pre-releases GH flow with success (run);

Types of changes

• New feature or improvement (non-breaking change which adds functionality)

Related issue(s):

1. fixes https://github.com/handsontable/dev-handsontable/issues/1402

Affected project(s):

• handsontable
• @handsontable/angular
• @handsontable/react
• @handsontable/vue
• @handsontable/vue3

Checklist:

• I have reviewed the guidelines about Contributing to Handsontable and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement
• My change requires a change to the documentation.

[github-actions]

Launch the local version of documentation by running:

npm run docs:review 054ea8f5ed232acaeaf102ecb00d5bdfe0c1f37c