[CI] Make snapshot tests great again

[testableapple]

Resolves https://stream-io.atlassian.net/browse/PBE-5883

🎯 Goal

• Fix the Snapshot Testing workflow on GitHub Actions

⚠️ Known issues

• The workflow is disabled on PRs because sometimes remote images are not shown on the screenshots. We should mock the images or use local ones. More details can be found here.

☑️Contributor Checklist

General

• I have signed the Stream CLA (required)
• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#android-chat-core or #android-chat-ui) (required)
• PR targets the develop branch
• PR is linked to the GitHub issue it resolves

Code & documentation

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (KDocs, docusaurus, tutorial)

☑️Reviewer Checklist

• UI Components sample runs & works
• Compose sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• Release notes and docs clearly describe changes
• All code we touched has new or updated KDocs

🎉 GIF