feat: add support for webp in imagick

[stnguyen90]

What does this PR do?

Because libwebp was not installed, imagemagick-dev wasn't installed with webp support. To ensure downstream dependencies to support webp, libwebp must be installed along with imagemagick-dev

Test Plan

Updated tests to check for WEBP as supported format

Related PRs and Issues

• WEBP images preview not working in 1.8.0 appwrite#10699
• feat: add support for webp in imagick #50

Have you read the Contributing Guidelines on issues?

Yes

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-imagick-webp-0.10.x

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