Enhance error handling for entity generation by checking for primary keys and unsupported types

[TharmiganK]

Purpose

$Subject

Examples

N/A

Checklist

• Linked to an issue
• Updated the specification
• Updated the changelog
• Added tests

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.98%. Comparing base (4e968c9) to head (f665376).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../io/ballerina/persist/introspect/Introspector.java	25.00%	2 Missing and 1 partial ⚠️
...generator/syntax/sources/DbModelGenSyntaxTree.java	66.66%	1 Missing and 1 partial ⚠️
...ist/nodegenerator/syntax/sources/DbSyntaxTree.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
- Coverage   86.13%   85.98%   -0.16%     
==========================================
  Files          68       68              
  Lines        6586     6593       +7     
  Branches      878      880       +2     
==========================================
- Hits         5673     5669       -4     
- Misses        653      661       +8     
- Partials      260      263       +3     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud