Update metadata.yaml

[knottnt]

Issue #, if available:

Description of changes:

• Update metadata.yaml service full and short names to "Agents for Amazon Bedrock" and "Bedrock Agents"
• Regenerate Helm template descriptions
• Regenerated sdk.go code to have union field member fix.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

@knottnt: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
bedrockagent-verify-attribution	192b031	link	false	/test bedrockagent-verify-attribution

Full PR test history. Your PR dashboard.

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[a-hilaly]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, knottnt

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