feat: (PSKD-813) add support for K8s 1.31

[saschjmil]

Update files necessary to change kubectl version to 1.30.6 in support of K8S 1.31.

Changes:

This PR updates the default version of kubectl to add support for K8s 1.31

• Default kubectl version is updated to 1.30.6

Tests:

Verified following scenarios, see internal ticket for details.

Scenario	Provider	kubernetes_version	Order	Cadence	Notes
1	Azure	1.31.2	***	fast:2020	OOTB, external Postgres Database, front-door TLS. Overwrite kubectl version in DO
2	GCP	1.29.10	***	fast:2020	OOTB, external Postgres Database, front-door TLS. DO: true
3	AWS	1.30.6	***	fast:2020	Used local tooling. Internal Postgres Database, full-stack TLS. DO: false