doc: add local service backend pool updater retry design#10417
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What type of PR is this?
/kind design
What this PR does / why we need it:
Adds a design document for refining the local service backend pool updater retry and error handling behavior.
The design covers bounded updater-level retries, 429 throttling handling, 409/412 conflict retries, SDK retry boundaries, event semantics, queue merge behavior, shutdown behavior, metrics, and the expected unit test coverage.
Based on #10253 with refinements and aligned with #10328.
Which issue(s) this PR fixes:
NONE
Special notes for your reviewer:
This is a design-only PR. It intentionally treats retryrepectthrottled.GetRetriableStatusCode() statuses as terminal at the updater layer because the Azure SDK retry policy already handles those statuses before the updater sees the error.
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: