[CIS-1242] Fix memory leak in GalleryVC

[nuno-vieira]

🔗 Issue Link

CIS-1242
Possibly related to #1601 (Not sure)

🎯 Goal

Fix memory leak of GalleryVC when opening the gallery preview. There was a memory leak caused by a forgotten weak ref of the transition context in the ZoomDismissalInteractionController.

🛠 Implementation

Make ZoomDismissalInteractionController.transitionContext a weak ref.

🧪 Testing

1. Open a channel
2. Open multiple times the gallery image preview
3. Go back to the channel list
4. Logout
5. Open the Memory Graph
6. Verify there are no GalleryVC instances in memory
   (If you do these steps on main, you can see multiple instances of GalleryVC)

🎨 Changes

N/A

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[codecov]

Codecov Report

Merging #1631 (fcb7468) into main (ff4f801) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1631   +/-   ##
=======================================
  Coverage   85.13%   85.13%           
=======================================
  Files         230      230           
  Lines       11048    11048           
=======================================
  Hits         9406     9406           
  Misses       1642     1642           

Flag	Coverage Δ
llc-tests	85.13% <ø> (ø)

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