feat(kibana): allow supplying xpack encryption keys

[Oddly]

The kibana role generates random xpack.security.encryptionKey and xpack.encryptedSavedObjects.encryptionKey on first run.

When migrating Kibana to a new host or running multiple instances, these keys must match the existing ones. Otherwise encrypted saved objects (alerting rules, connectors, Fleet tokens) and session state cannot be decrypted by the new instance.

This adds kibana_security_encryptionkey and kibana_encryptedsavedobjects_encryptionkey to supply the keys (written to the keystore via the existing flow). Both default to empty, preserving the generate-random behaviour, so there is no change for existing users. The kibana_custom molecule scenario sets both and asserts the provided values are stored in the keystore.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: e7e78785-69e7-4e5d-ad97-7cff409d65af

📥 Commits

Reviewing files that changed from the base of the PR and between 76f7a50 and e136cdf.

📒 Files selected for processing (4)

• molecule/kibana_custom/converge.yml
• molecule/kibana_custom/verify.yml
• roles/kibana/defaults/main.yml
• roles/kibana/tasks/kibana-security.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/kibana-encryption-keys

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