This reverts the Bedrock CI account migration (#28728). The original account
(888602223428) was put under an AWS security restriction after a leaked key
and has since been reactivated, while the replacement account (941277531214)
lacks access to several models the suites exercise (legacy Bedrock Claude 3
models, Cohere, Nova Canvas image gen, Bedrock batch inference, and flagship
Opus). Pointing CI back at the reactivated account restores that coverage.
This is the exact inverse of #28728: all hardcoded 941277531214 references go
back to 888602223428 (provisioned/imported-model ARNs, AgentCore runtime ARNs
and their suffixes, batch execution role ARN, and the example proxy config),
the S3 buckets revert to litellm-proxy and load-testing-oct, the guardrail IDs
revert to wf0hkdb5x07f and ff6ujrregl1q, the SageMaker endpoint and Knowledge
Base revert to their original ids, and the live-call tests go back to the
legacy model strings. The grid_spec fail_reason workaround for the unentitled
Opus cells is dropped while keeping the unrelated bedrock_effort_ceiling field
added after the migration.
The CircleCI AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY env vars still point at
941277531214 and must be set to the reactivated account's fresh credentials
separately via the CircleCI API; AWS_REGION_NAME stays us-west-2.
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