Improve tenants logic.

[jfrancoa]

Summary

• Add --tenants <list> to create tenants for creating tenants by explicit name
  instead of auto-generated suffix+counter patterns
• Add --tenants <list> and --auto_tenants N to create data for targeted ingestion
  into specific or auto-generated tenants (requires auto_tenant_creation on the collection)
• Extract _resolve_tenants_for_ingestion() in DataManager to centralise the
  MT vs non-MT, auto-creation, explicit-list, and suffix-fallback resolution logic
• Fix missing json_output support in TenantManager.create_tenants()
• Strip whitespace and filter empty entries from all comma-separated --tenants inputs
  across create, update, and delete commands

Closes #157
Fixes #155

Test plan

• make lint passes
• make test passes (229/229 unit tests)
• Unit tests cover all _resolve_tenants_for_ingestion() decision branches and error paths
• create tenants --tenants "A,B,C" creates exactly those tenants
• create tenants --json produces structured JSON output
• Whitespace in --tenants "A, B, " handled gracefully (stripped + empty entries dropped)

🤖 Generated with Claude Code

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[Copilot]

Pull request overview

This PR refactors tenant handling in the CLI to support explicitly named tenants during creation and to better control which tenants are targeted during data ingestion, including behavior when auto-tenant creation is enabled at the schema level.

Changes:

• Add support for creating tenants from an explicit --tenants list (instead of only auto-generating names).
• Refactor tenant creation logic into helper methods for name resolution and post-create verification.
• Add a tenant-resolution helper for data ingestion to handle MT/non-MT collections and tenant selection options more cleanly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
weaviate_cli/managers/tenant_manager.py	Adds explicit tenant list support and refactors generation/verification into helpers.
weaviate_cli/managers/data_manager.py	Adds _resolve_tenants_for_ingestion() and refactors create_data() tenant selection flow.
weaviate_cli/defaults.py	Extends tenant-creation defaults to include an optional tenants list.
weaviate_cli/commands/create.py	Adds --tenants option to the create tenants CLI command and wires it into TenantManager.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

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