Fix Repeat option not applied in CustomAnimation

[lgztx96]

Fixes

#840

PR Type

What kind of change does this PR introduce?

Bugfix

What is the current behavior?

Since the Repeat option is not forwarded, repeatOption is null in AnimationBuilder.NormalizedKeyFrames and defaults to RepeatOption.Once.

Windows/components/Animations/src/Builders/AnimationBuilder.KeyFrames.cs

Line 345 in 9ce8a94

repeatOption ?? RepeatOption.Once,

What is the new behavior?

CustomAnimation.AppendToBuilder now forwards the Repeat option to AnimationBuilder.NormalizedKeyFrames, allowing animations to repeat according to the configured Repeat option.

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs
• Tests for the changes have been added (if applicable)
• Header has been added to all new source files
• Contains NO breaking changes

Other information

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