fix wrong exceptions being thrown when duplicates occur in WoT parsing

[thjaeckle]

• replace IllegalStateException with WotThingModelInvalidException to avoid "WoT internal server" errors with status code 500 and not useful error description

[Copilot]

Pull Request Overview

This PR replaces IllegalStateException with WotThingModelInvalidException when duplicate keys are detected during WoT (Web of Things) parsing operations. This change ensures proper error handling with appropriate HTTP status codes and meaningful error descriptions instead of generic 500 Internal Server errors.

Key Changes:

• Replaced all IllegalStateException throws in duplicate key merge functions with WotThingModelInvalidException
• Added descriptive error messages specifying the context of each duplicate (e.g., "Properties:", "Events:", "Titles:")
• Updated WotThingModelPayloadValidationException.readValidationDetails() to accept DittoHeaders for proper exception construction

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
WotThingModelPayloadValidationException.java	Updated to throw WotThingModelInvalidException for duplicate validation detail keys and pass DittoHeaders through
InternalValidation.java	Replaced duplicate property key exception with WotThingModelInvalidException
UriVariables.java	Replaced duplicate URI variable exception with WotThingModelInvalidException
Titles.java	Replaced duplicate title exception with WotThingModelInvalidException
SecurityDefinitions.java	Replaced duplicate security scheme exceptions with WotThingModelInvalidException
SchemaDefinitions.java	Replaced duplicate schema definition exception with WotThingModelInvalidException
Properties.java	Replaced duplicate property exceptions with WotThingModelInvalidException
ImmutableObjectSchema.java	Replaced duplicate object property exception with WotThingModelInvalidException
Events.java	Replaced duplicate event exceptions with WotThingModelInvalidException
Descriptions.java	Replaced duplicate description exception with WotThingModelInvalidException
Actions.java	Replaced duplicate action exceptions with WotThingModelInvalidException
DefaultWotThingModelValidator.java	Added merge function with WotThingModelInvalidException for duplicate submodel handling
DefaultWotThingModelResolver.java	Added merge function with WotThingModelInvalidException and explicit LinkedHashMap for duplicate submodel handling

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