feat(azure_blob): make storage API version configurable

[opencow]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Regenerate the Azure Blob component reference

Add the generated documentation entry for api_version to website/cue/reference/components/sinks/generated/azure_blob.cue; without it, the public Azure Blob configuration reference omits this new user-facing option and make check-generated-docs will report the generated docs as stale.

AGENTS.md reference: AGENTS.md:L206-L212

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[chatgpt-codex-connector]

Enforce the exact API-version wire format

Reject non-canonical inputs such as 2021-8-6: Chrono's numeric date directives accept unpadded components, but the original string is then copied unchanged into x-ms-version. In that case the sink builds successfully and only fails later when Azure rejects the unsupported header during the healthcheck or uploads, despite the validation error promising an exact YYYY-MM-DD format.

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