Issue #10924: Update TrailingCommentCheck to use code points

[MUzairS15]

Issue #10924: Updated TrailingCommentCheck to use code points

Diff Regression config: https://gist.githubusercontent.com/MUzairS15/338aa5815422d64fc1e119861cac1336/raw/ef19e01810ccc472e359e17175cb8dd5885d983c/config.xml

Proof that check requires update: #11422 (comment)

[MUzairS15]

@nick-mancuso Pls review.

[nrmancuso]

➜  java cat config.xml 
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
        "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
    <module name="TreeWalker">
        <module name="TrailingCommentCheck">
            <property name="legalComment" value="^ this is ok"/>
        </module>
    </module>
</module>
➜  java cat Test.java 

public class Test {
    int x = 9; /* this is ok */
    String z = "aaaaaa"; /* violation */
    String y = "😊😊😊😊😊😊"; /* violation */
}
➜  java javac Test.java 
➜  java java -jar checkstyle-10.0-all.jar -c config.xml Test.java
Starting audit...
[ERROR] /home/nick/IdeaProjects/Tester/src/main/java/Test.java:8:26: Don't use trailing comments. [TrailingComment]
Audit done.
Checkstyle ends with 1 errors.

I would expect a violation on line 9 as well.

[MUzairS15]

Updating PR

[MUzairS15]

Github, generate report

[github-actions]

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/b8e1615_2022123314/reports/diff/index.html

[nrmancuso]

One minor:

[nrmancuso]

Item: