Resolve IMDS region from placement/region endpoint#3718
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InstanceMetadataRegionFetcher derived the region by querying IMDS placement/availability-zone and stripping the last character. That works for standard AZs (us-east-2a -> us-east-2) but produces an invalid region for Local Zones and Wavelength Zones (us-east-2-sbn-1a -> us-east-2-sbn-1), which breaks endpoint resolution for instances running in those zones. Query the placement/region endpoint, which returns the true parent region directly, and fall back to the availability-zone heuristic only when that endpoint is unavailable (older or third-party IMDS implementations).
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InstanceMetadataRegionFetcher derived the region by querying IMDS placement/availability-zone and stripping the last character. That works for standard AZs (us-east-2a -> us-east-2) but produces an invalid region for Local Zones and Wavelength Zones (us-east-2-sbn-1a -> us-east-2-sbn-1), which breaks endpoint resolution for instances running in those zones.
Query the placement/region endpoint, which returns the true parent region directly, and fall back to the availability-zone heuristic only when that endpoint is unavailable (older or third-party IMDS implementations).
See also aws/aws-cli#10374
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