Retry transient Renovate package restores

[Jevan Saks (jevansaks)]

Summary

• retry package and tool restores when a Renovate PR encounters a transient package-feed cache miss
• preserve single-attempt behavior for all other callers and fail unrelated restore errors immediately
• apply the retry window to build, test, and documentation validation jobs

Rationale

New dependency versions can appear in feed metadata before their package content is available to PR validation. A separate authenticated build may populate the configured feed shortly afterward. Waiting and retrying the recognized transient failure avoids leaving otherwise-valid Renovate PRs red until someone manually retriggers them.

Validation

• exercised cache-miss retry and unrelated-failure behavior with synthetic restore commands
• validated PowerShell syntax and checked the diff for whitespace errors