Use integrate instead of add_relation or relate

[DnPlas]

Bug Description

juju relate is the way juju made integrations between two applications, but in 3.x it was deprecated in favour of juju integrate. This has to be reflected in:

• Docs
• Integration tests
• Unit tests (if applicable)

relate and add_relation will be removed soon, and there have been warning messages all around, for example:

WARNING juju.model:model.py:1564 relate is deprecated and will be removed. Use integrate instead.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5517.

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[orfeas-k]

I think what you 're saying is true for add-relation but not relate. From juju 3.4 and on, you don't see that deprecation message anymore. My guess is that they decided to keep it as an alias as it mentions on top of this page, but I 'm not 100% about this.