Propose to remove support for CompactStrings off

[wenshao]

Initially, the option to disable CompactStrings was provided for performance reasons. 
However, with some optimizations for UTF8 scenarios and Latin1, disabling CompactStrings no longer has any performance benefits. I propose removing the related code to make it simpler and easier to maintain.
I've submitted a draft Pull Request ( https://github.com/openjdk/jdk/pull/27988 <https://github.com/openjdk/jdk/pull/27988 > ) and would appreciate your feedback.
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Shaojin Wen
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