[T056] Add --api-version global flag support

[petehauge]

Phase: Phase 8: Polish & Cross-Cutting Concerns
Parallel: [P] Can run in parallel

Add --api-version global flag support in:

• src/cli/index.ts
• src/clients/apim-client.ts

Override default 2024-05-01 per FR-012

[petehauge]

We haven't gotten any customer requests for this, closing as not planned for now. We should just always point at the latest api version and can add a flag if customers really need it.