refactor: Move common Application initialization code to shared file

[MartinZikmund]

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GitHub Issue (If applicable): closes #

PR Type

What kind of change does this PR introduce?

• Refactoring (no functional changes, no api changes)

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Docs have been added/updated which fit documentation template (for bug fixes / features)
• [ ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ ] Validated PR Screenshots Compare Test Run results.
• [ ] Contains NO breaking changes
• [ ] Associated with an issue (GitHub or internal) and uses the automatic close keywords.
• [ ] Commits must be following the Conventional Commits specification.

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Internal Issue (If applicable):

[unodevops]

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[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or it will be closed in 10 days.

[MartinZikmund]

Replaced by https://github.com/unoplatform/uno-private/pull/850