[BUG] Node creation in pipeline overrides existing nodes with conflicting names

[SamvelSimonyan]

Steps to reproduce:

1. In the pipeline, create a node of one type (e.g., LLM node) and assign it a name specific to another type (e.g., "Printer 1").
2. Add a new node of the conflicting type (e.g., Printer node).

Actual results:

• The existing LLM node named "Printer 1" is replaced by the newly created Printer node.

2026-02-20_14h22_16.mp4

Expected results:

• When creating a new node, the default name assigned to the node should be checked against all existing nodes, regardless of type, to prevent name conflicts and unintended overrides.

[HawkQing1]

@SamvelSimonyan it should be fixed on dev, please verify it.

[SamvelSimonyan]

Verified on dev