Replace generic Exception with NotSupportedException in FlatWorldStateModule

[Copilot]

Changes

• Replaced throw new Exception(...) with throw new NotSupportedException(...) for unsupported FlatDB layout configurations (line 85)
• Replaced throw new Exception(...) with throw new NotSupportedException(...) for disabled factory components (lines 44-45)

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

Documentation

Requires documentation update

• Yes
• No

Requires explanation in Release Notes

• Yes
• No

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