[MAINT] Add regression test for #2614

[deiga]

• Separate Unit tests to own Test func
• Add test to ensure that destroy_on_drift and ignore_changes together prevents replacement of externally modified secret

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Before the change?

• No test to verify that destoy_on_drift = false and lifecycle.ignore_changes = [plaintext_value, encryped_value] would not update plan on external changes

After the change?

• Regression test to ensure that external changes don't force changes on a secret with destoy_on_drift = false and lifecycle.ignore_changes = [plaintext_value, encryped_value]

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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