Enhance EC2 CloudFormation templates for AI models with new parameter…

[Anusha-janardhan]

…s and resources

• Added parameters for ProjectId, ResearcherName, and CostResource to support tagging and cost allocation.
• Introduced conditions and resources for Bedrock Mantle projects in ec2-dcv-claudeOnBedrock.yml, ec2-dcv-codex.yml, and ec2-dcv-codexOnBedrock.yml.
• Updated IAM policies to include permissions for Bedrock and S3 actions.
• Enhanced user data scripts to configure AI models for Bedrock Mantle usage.
• Added outputs for Mantle project details in the templates.

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[RLIndia]

We have moved from specific bedrock permissions to bedrock:*. Explain why that is necessary as it makes the possible API calls wide open.