fix: use actual type for $this->typeTable

[stefanorosanelli]

This PR improves the robustness of the object import process by ensuring that only valid object types are used and by handling cases where an object type does not exist and avoiding ObjectsTable direct usage on types extending objects directly.

Initialization and object type validation:

• Refactored the constructor in Import.php to set the typeTable property only to valid and actual types

Error handling improvements:

• Updated the saveObject method to throw a BadRequestException if the typeTable is not set, providing a clear error message when an invalid object type is encountered.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (87b84b6) to head (4404737).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #32   +/-   ##
=========================================
  Coverage     98.90%   98.90%           
- Complexity      139      141    +2     
=========================================
  Files            12       12           
  Lines           638      639    +1     
=========================================
+ Hits            631      632    +1     
  Misses            7        7           

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[Copilot]

Pull request overview

This PR hardens the import pipeline by validating the requested object type before choosing the table used to create/save entities, and by producing a clearer client error when an invalid object type is provided.

Changes:

• Refactors Import construction to set $this->typeTable only when the object type exists (via new objectTypeExists()).
• Adds a BadRequestException guard in saveObject() when no valid type table is available.

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