Fix/expanding by default

[bittakv]

• Rewrite updateDecendantState in order to propagate checked and expanded state on the way to the top of the tree in FhiTreeViewSelectionComponent
• Remove internal state descendantStateConfirmed as it is no longer needed

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[yleaxeman]

Use this attached file in example to test a large file in Tree View example component:

alle_atckoder_som_items.json

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[bittakv]

@proand , @yleaxeman , @dafn , I don't know your routines for completing the PR, will you lot handle the PR from here? Fhi statistikk is very eager to see the fix in a release as soon as possible :-)

[proand]

Normally the assignee would complete the PR, but I can do it 😉