RFR: 8277348: Use String.stripTrailing() in jdk.jshell where applicable

[Andrey Turbanov]

On Fri, 12 Nov 2021 09:10:16 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> There are 2 methods in jdk.jshell module which trim trailing whitespace characters from String.
> 1. jdk.internal.jshell.tool.JShellTool#trimEnd
> 2. jdk.jshell.Util#trimEnd
> 
> Since Java 11 we have a method String.stripTrailing which could be used instead.

Let's wait for reviewers a bit more

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PR: https://git.openjdk.java.net/jdk/pull/6365