Fix SKCanvasView dispose exception when the view is disposed before it's rendered

[jjzhang12]

Description of Change

Fix SKCanvasView dispose exception when the view is disposed before it's rendered

Bugs Fixed

• Fixes [BUG] In Blazor, Dispose() of SkCanvasView throws NullReferenceException when parent component shows and hides multiple skia canvas views #2441

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[mattleibow]

@jjzhang12 it looks like you have not agreed the CLA. Just reply with a comment to agree.

[jjzhang12]

@dotnet-policy-service agree

…

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