style: fix photos hover animation

[RominaMarchetti]

What does this PR change?

This PR was created to fix the hover animation of the photos: removes the scale on hover, erasing the issue of not seeing side of the outline when a photo is inside and next to mask edge (as happens in the Profile and in the Scene's Info Cards in the map). Also, replaces the texture which emulated an outline for a real outline. The final result is a neat hover animation which works in every context.

BEFORE
https://github.com/user-attachments/assets/105f4300-c4fa-4919-9ff4-f91635956f5d

Screenshots of the outline getting chopped in the map and profile card

AFTER
https://github.com/user-attachments/assets/7c7c5450-c2da-49bc-b8f4-98a22cb80a0d

How to test the changes?

1. Launch the explorer
2. Go to the gallery and hover any photo. Check the scale animation was removed and that the outline appears inside the photo edges instead of outside.
3. Go to the map and open the info card of a scene which contains photos (Genesis Plaza, for example). Go to the photos section, then repeat the action from task 2.
4. Open your profile card (if you don't have any public photo, set one as public). Go to the photos section, then repeat the action from task 2.

[github-actions]

Windows and Mac build successfull in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	eeee19e
Logs	https://github.com/decentraland/unity-explorer/actions/runs/13038728006
Download Windows	https://github.com/decentraland/unity-explorer/suites/33686560975/artifacts/2506546314
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/style/photos-outline/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/33686560975/artifacts/2506586316
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/style/photos-outline/Decentraland_macos.zip
Built on	2025-01-29T19:58:01Z

[Ludmilafantaniella]

🟢Approved by QA. Fix verified on Windows and Mac. Hover animation issue resolved, outline now appears correctly inside photo edges.

3250-fix.mp4