Fix geojson missing updates with persistent layer after style change

[kiryldz]

Summary of changes

Due to nulling delegate explicitly when Style is not valid anymore we faced the situation that geojson updates were skipped after style was changed but only when using persistent layers. Now that's fixed and also as the temp solution we do not write warnings for using invalid style object in order not to confuse the users - this will be revisited later as it requires a bit deeper thinking how to treat style object when using persistent layers.

User impact (optional)

Pull request checklist:

• Briefly describe the changes in this PR.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality. If tests were not written, please explain why.
• Optimize code for java consumption (@JvmOverloads, @file:JvmName, etc).
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• Run make update-api to update generated api files, if there's public API changes, otherwise the verify-api-* CI steps might fail.
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Fixes: < Link to related issues that will be fixed by this pull request, if they exist >

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[pengdev]

@kiryldz could you double check the cases for other style extension high level abstractions like layer and terrain/light?

[kiryldz]

@kiryldz could you double check the cases for other style extension high level abstractions like layer and terrain/light?

Other style abstractions where not touched. GeoJson source is the only placed where we added that as it uses async parsing.