[18.0][MIG] stock_intercompany: Migration to 18.0

[BhaveshHeliconia]

[github-actions[bot]]

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[BhaveshHeliconia]

Hey @OCA/intercompany-maintainers would be great if someone could have a look at this module.

[tgaona-sbg]

Hello OCA intercompany maintainers, would you mind to take a look on this PR ?

@JordiBForgeFlow @legalsylvain @LoisRForgeFlow

Thank you in advance !