SOD-824: Add scalingOrientation (orientation) field to Ocean AKS VNG strategy

[anjanobalesh]

Jira: https://flexera.atlassian.net/browse/SOD-824

What

Adds the orientation field to the shared ocean-strategy.yaml schema under api/services/ocean/aks/schemas/, used by the strategy object across all 4 Ocean AKS VNG operations (they all $ref the same schema file):

• Create VNG (oceanAKSVirtualNodeGroupCreate)
• Get/List VNG (oceanAKSVirtualNodeGroupGet / oceanAKSVirtualNodeGroupList)
• Update VNG (oceanAKSVirtualNodeGroupUpdate)
• Import VNG (oceanAKSVirtualNodeGroupImport)

Field

• Name: orientation (kept as-is to match the actual field name implemented in spotinst-api / spotinst-azure-ocean-common — the story named it scalingOrientation, but no rename was made in code, so the doc uses the real field name to stay accurate)
• Type: string, enum [cost, availability]
• Default: cost
• Description: "Set this value to control and manage optimization priorities."

Verification

• yarn validate (swagger-cli validate) — pass
• yarn bundle:swagger — pass
• npx @redocly/cli lint — no new errors/warnings introduced (3 pre-existing errors unrelated to this file)
• yarn bundle:redoc fails on this branch and equally on master (pre-existing redoc-cli React "Invalid hook call" dependency conflict, unrelated to this change)

Acceptance criteria

• orientation appears under strategy for all 4 ops (shared schema)
• Both values (cost, availability) documented via enum
• Default cost stated
• Samples auto-generated from schema example: cost