[WIP] Theme style fixes relative to active/inactive preventOverwriteStyles flag

[raheeliftikhar5]

Proposed changes

With this adaption, we improve the Themes Styles handling and here especially the attribute "prevent overwriting of local styles set in Apps by theme".

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

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