Fix found bugs in XML data library

[prakanth97]

Purpose

Fixes: #6092

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: Patch coverage is 88.76812% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 78.25%. Comparing base (931e925) to head (0d7066b).
Report is 5 commits behind head on main.

Files	Patch %	Lines
.../xmldata/compiler/XmldataRecordFieldValidator.java	79.66%	4 Missing and 8 partials ⚠️
...o/ballerina/stdlib/data/xmldata/xml/XmlParser.java	92.98%	0 Missing and 8 partials ⚠️
...ballerina/stdlib/data/xmldata/utils/DataUtils.java	60.00%	3 Missing and 3 partials ⚠️
...allerina/stdlib/data/xmldata/xml/XmlTraversal.java	93.87%	2 Missing and 1 partial ⚠️
ballerina/xml_api.bal	0.00%	1 Missing ⚠️
...llerina/stdlib/data/xmldata/xml/QualifiedName.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #5      +/-   ##
============================================
+ Coverage     74.35%   78.25%   +3.89%     
- Complexity      384      449      +65     
============================================
  Files            21       21              
  Lines          1833     2005     +172     
  Branches        420      440      +20     
============================================
+ Hits           1363     1569     +206     
+ Misses          370      328      -42     
- Partials        100      108       +8     

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[SasinduDilshara]

LGTM