feat(tfacc): enable bedrock with foundation models data source

[vieiralucas]

Summary

Batch 10 — adds Bedrock to the upstream Terraform acceptance harness.

`TestAccBedrockFoundationModelsDataSource_basic` passes against fakecloud out of the box. fakecloud's Bedrock implementation already returns the expected `ListFoundationModels` shape.

Triaged but deferred

Several other services were triaged in this batch but each needs substantive fakecloud-side work bigger than a single-batch budget:

• SES v2 — `TestAccSESV2EmailIdentity_basic_emailAddress` needs the verification flow rewired so new identities default to unverified (real AWS doesn't auto-verify email addresses), plus `current_signing_key_length` empty by default and `tokens` empty for email-address identities. Existing fakecloud e2e tests assume auto-verify, so fixing this needs both the impl change and updates to the e2e suite.
• CloudFormation — needs `AWS::EC2::VPC` resource type in the CFN provisioner.
• Cognito — needs ~5 schema blocks populated on `DescribeUserPool`.
• RDS — needs `DescribeOrderableDBInstanceOptions`.
• Lambda — needs EC2 `DescribeAvailabilityZones`.
• Step Functions — depends on Lambda; `SFNActivity` needs `CreateActivity`.
• S3 — needs many fields populated (`bucket_regional_domain_name`, `hosted_zone_id`, `region`, etc).

Each gets its own batch as the underlying gaps close.

Test plan

• Upstream locally: `TestAccBedrockFoundationModelsDataSource_basic` passes (~6s)
• `cargo clippy -p fakecloud-tfacc --all-targets -- -D warnings` clean
• CI `tfacc bedrock` green
• All other tfacc jobs still green
• Cubic clean

---

Summary by cubic

Enable Bedrock acceptance in fakecloud-tfacc by running the data.aws_bedrock_foundation_models data source test against fakecloud. This adds the bedrock service to the allowlist and a test; ListFoundationModels is already supported, so the smoke test passes.

• New Features
  • Allowlist bedrock with regex ^TestAccBedrockFoundationModelsDataSource_basic$.
  • Add bedrock_acceptance test to run the service in the tfacc harness.

^{Written for commit ece004e. Summary will update on new commits.}

[cubic-dev-ai]

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