Add IsEmptyOrAtEnd method to StringSegment

[mostafanasiri67]

This commit adds the IsEmptyOrAtEnd method to the StringSegment class. The method checks if the StringSegment is null or empty, or if the provided index is at the end of the segment. This enhances the validation capabilities of StringSegment.

Add IsEmptyOrAtEnd method to StringSegment

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Summary of the changes (Less than 80 chars)

Description

adds the IsEmptyOrAtEnd method to the StringSegment class

Fixes #59242

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