Add missing InputDecorator.hintText tests (#148113)

## Description

This PR reorganized some `InputDecorator.hintText` tests and add many of them (theses tests are organized similarly to the M3 spec, see https://m3.material.io/components/text-fields/specs).

This is somewhat repetitive but it helped me to catch two hint styling issues (wrong colors and font), I added TODOs because I will file the fixes once this PR is merged (just in case the fixes break some Google tests). The test I added are from lines 2779 to 3952 (below it is existing tests that I moved). 

## Related Issue

Part of https://github.com/flutter/flutter/issues/139076
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Bruno Leroux 2024-05-14 23:29:53 +02:00 committed by GitHub
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commit ced962d870
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