minus() method incorrectly removed the first occurrence of a given suffix so make new method, removeLast() in TextUtil, which correctly removes only the last occurrence of a given suffix if it appears at the end of the string.

• Fixes distZip top level directory has wrong name when version has substring ".zip" #32621

Context

The previous implementation of TextUtil.minus() incorrectly removed the first occurrence of a given suffix in a string, causing unintended modifications when the suffix appeared in the middle of the string.

To fix this, I introduced a new method, TextUtil.removeLast(), which ensures that only the last occurrence of a given suffix is removed if it appears at the end of the string.

Additionally, I updated DistributionBasePlugin.java to use removeLast() instead of minus().

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