Optimized Images are reoptimized when activate/deactivate AVIF option and next-gen is regenerated

[Mai-Saad]

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Describe the bug When activate/ reactivate avif, the bulk optimization notice displayed and optimized images are reoptimized

To Reproduce Steps to reproduce the behavior:

1. Activate imagify , enable avif then disable it to bypass this issue
2. Upload some images (small , medium, large) => webp created (notice the timestamp/size for optimized images)
3. Enable AVIF => wait till avif is created
4. notice the timestamp for optimized images => timestamp changed while size is the same
5. deactivate AVIF
6. notice the existing webp is regenerated and timestamp is updated for optimized images

Expected behavior No change in optimized images timestamp (as same as when click generate next-gen link)

Screenshots If applicable, add screenshots to help explain your problem. With activation: screen-capture (85).webm

Additional context Add any other context about the problem here.

• this issue may have impact on servers CPU
• click generate next-gen link won't reoptimize the image so may be we can reuse that
• generate next-gen link will appear shortly for images that already have AVIF/WEBP

Acceptance Criteria (for WP Media team use only) Clear instructions for developers, to be added before the grooming

• Enable AVIF won't reoptimize image nor recreated existing avif
• Disable AVIF won't reoptimize image nor recreate existing webp
• Will leave the bulk notice to @wp-media/productimagify to decide about it (in general recommend different notice unless if we will merge bulk optimization with avif in single option)