[share] Show the share text in the iOS share preview panel

[gapspt]

Description

Show the share text in the iOS share preview panel.

Before it just didn't show any preview of the text being shared.

Related Issues

flutter/flutter#55061
flutter/flutter#60470

Checklist

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Breaking Change

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[benPesso]

Will this also fix flutter/flutter#55061 ?

[gapspt]

@benPesso yes, it should. Although I don't think it will fix the "weird ) print", I haven't noticed that happening and have no idea what's that about.

[stuartmorgan-g]

Thanks for the submission! However, we’re currently not accepting non-critical PRs for this plugin, as we hope in time to be able to transition users to the corresponding plugin in the Flutter Community Plus Plugins repository. We encourage you to submit your PR there.

(Note that the issue mentioned above of unconditionally using an iOS 13 framework, rather than weak-linking it, would presumably need to be resolved before it could be landed there as well.)

We apologize for the long delay in triaging this PR. We’re in the process of overhauling our PR triage system to respond much more quickly, as well as working through the backlog.