[Webkit-unassigned] [Bug 251691] New: Use `isControlCharacter()` helper

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251691

            Bug ID: 251691
           Summary: Use `isControlCharacter()` helper
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vitaly at igalia.com
                CC: mmaxfield at apple.com

Several ways to check whether a character is a Unicode control character are used throughout the codebase. Such as:
```
u_charType(character) == U_CONTROL_CHAR
```
or
```
(character >= nullCharacter && character < space) || (character >= deleteCharacter && character < noBreakSpace)
```
We have a nice helper for this in `CharacterProperties.h` - `isControlCharacter()`.
It would be nice to use it since it is shorter and describes the intent better.

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