Add documentation for V2 pipeline identifiers for #2143

[Tednoob17]

Summary

Add documentation listing the identifiers used by V2 pipelines.

Changes

• add a dedicated refrence page for V2 pipeline identifier
• link the new page from the docs index
• clarify in the CLI docs that V2 importers and improvers uses pipeline_id

[Copilot]

Pull request overview

Adds a dedicated reference page to document the pipeline_id identifiers used by V2 importer and improver pipelines, and updates the docs index and CLI docs to point users to the correct identifier concept.

Changes:

• Add reference_v2_pipeline_identifiers.rst listing V2 importer/improver pipeline_id values.
• Link the new reference page from the main docs index.rst.
• Clarify in CLI docs that for V2 pipelines the “name” passed to import/improve is the pipeline_id.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/source/reference_v2_pipeline_identifiers.rst	New reference page enumerating V2 pipeline identifiers and where they’re registered.
docs/source/index.rst	Adds the new reference page to the Reference Documentation toctree.
docs/source/command-line-interface.rst	Clarifies import/improve argument naming for V2 pipelines (pipeline_id).

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