Reintroduce - Server.xml configuration error not detected.

[jimblye]

• I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• Fixes Server.xml configuration error not detected. #33453
• Fixes Server.xml configuration error not detected. #33453

Reintroduces #33455, but ignores zero-width characters. These characters don't interfere with the parsing and cannot be mistaken for a missing "<" on an element. These characters might be inserted during copy/paste operation:
U+200B: Zero Width Space
U+200C: Zero Width Non-Joiner
U+200D: Zero Width Joiner
U+FEFF: Zero Width No-Break Space (BOM)
U+2060: Word Joiner

The original PR detected and displayed an error message for 3 existing server.xml files which contained some of these invisible characters:

com.ibm.ws.request.timing.monitor_fat/publish/servers/RequestTimingFeatureWithEventFeature/server.xml
Line 34:  extraneous unicode character
io.openliberty.microprofile.openapi.2.0.internal_fat/publish/servers/OpenAPIMergeWithServerXMLTestServer/server.xml
Line 27:extraneous unicode character
io.openliberty.microprofile.openapi.2.0.internal_fat/publish/servers/OpenAPIWarningMessageTestServer/server.xml
Line 23:extraneous unicode character

[jimblye]

Found a server.xml file in WS-CD-Open having a back tick ` between elements.
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[jimblye]

#build
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Code analysis and actions

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• 2 product code files were changed.

• Please describe in a separate comment how you tested your changes.

• 1 messages files were changed and need an L2 review.

• @OpenLiberty/message-reviewer Please review.

  • dev/com.ibm.ws.config/resources/com/ibm/ws/config/internal/resources/ConfigMessages.nlsprops

• 1 NLS files were changed and need an ID review.

• @OpenLiberty/message-reviewer Please review.

  • dev/com.ibm.ws.config/resources/com/ibm/ws/config/internal/resources/ConfigMessages.nlsprops