Fix crash in a GIFAnimatedImage extension

[kean]

Fixes #24030

To test:

• Test Reader feed that have some GIFs

Note: there are some existing issues with restart of animations on reload. I believe they've been there before.

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

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[kean]

I moved this code to an extension without realizing the method named prepareForReuse already existed on GIFAnimatable. There needs to be a more durable solution, but I fixed it like this for now.

The issue with the standard prepareForReuse is that it only works for animated images, AFAIR.

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📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

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	Configuration	Release-Alpha
	Build Number	pr24031-c53811d
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