Remove integration from state if it was removed manually (#186)

[amandahla]

Description

Currently, if integration is removed manually, terraform plan fails with "no integrations exist in specified model". This PR changes the behavior to remove it from the state instead.

Type of change

Please mark if proceeds.

• New resource (a new resource in the schema)
• Changed resource (changes in an existing resource)
• Logic changes in resources (the API interaction with Juju has been changed)
• Test changes (one or several tests have been changed)
• [X ] Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Other (describe)

Environment

• Juju controller version: 2.9.42
• Terraform version: 1.4.4

QA steps

Manual QA steps should be done to test this PR.

The same that was reported in issue #186

Additional notes

It might be worth doing this for all the resources and also creating a specific error for that instead of checking the error message.

[juanmanuel-tirado]

The situation reported in #186 cannot be reproduced after #189 was landed. This is a good check.

Thanks for the PR!!

[juanmanuel-tirado]

@amandahla I'm OK with the changes. Failing tests are not due to these changes. Ready to merge if you're OK with the PR.

[juanmanuel-tirado]

Fix #186
Fix #187

[amandahla]

@amandahla I'm OK with the changes. Failing tests are not due to these changes. Ready to merge if you're OK with the PR.

Awesome! Thanks.