Fix layout overflowed in small screen in SensitiveContent's example

[huycozy]

• After Add SensitiveContent widget sample code #183846 was landed on main (https://main-api.flutter.dev/flutter/widgets/SensitiveContent-class.html), I found an overflowed layout issue when the example runs on web in a narrow height.
• This fix is straightforward by adding SingleChildScrollView to wrap the account detail widget content.

before	after

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• I listed at least one issue that this PR fixes in the description above.
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• I added new tests to check the change I am making, or this PR is test-exempt.
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[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

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[gemini-code-assist]

Code Review

This pull request wraps the Column widget in _AccountDetailsContent with a SingleChildScrollView to allow its content to scroll. The review suggests applying const to the SingleChildScrollView and its children for improved performance and adherence to Dart best practices, which also addresses a potential lint error regarding const usage.

[AbdeMohlbi]

@huycozy this would need a test exemption

[huycozy]

@huycozy this would need a test exemption

Thank you for reviewing. This had an additional test already, please check at https://github.com/flutter/flutter/pull/184179/changes#diff-7e072db00b6c423984d230a8564d531f53d39b0e44d0cafd74c5043a88b139d3R91

[huycozy]

@AbdeMohlbi could you please re-approve this? thanks!

[justinmc]

LGTM thanks Huy! 👍