PYIC-8298: Allow InitialiseIpvSession to decrypt with any KMS key

[MikeCollingwood]

Proposed changes

What changed

• Allow InitialiseIpvSession to decrypt with any KMS key

Why did it change

• So we can rotate keys in future. At the moment we don't allow decryption with different keys, which means this would have to be updated exactly when we update the key, which we cannot do.

Issue tracking

• PYIC-8298

Checklists

• READMEs and documentation up-to-date
• API/ unit/ contract tests have been written/ updated
• No risk of exposure: PII, credentials, etc through logs/ code
• Production changes appropriately staged out

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud