fix(ios): FormattedString and Span a11y font scale

[CatchABus]

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• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

iOS a11y font scale does not affect FormattedStrings and Spans.

What is the new behavior?

iOS a11y font scale will affect FormattedStrings and Spans.

Fixes #10272 .

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🟥 Failed Commands
nx run apps-automated:ios --timeout=600

✅ Successfully ran 2 targets

• nx run webpack5:build
• nx run-many --target=test --configuration=ci --projects=core

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