Adding a new Skill and Custom agent for EOS price analysis

[rajatgoy]

Description

This PR is to add a new skill and custom agent for EOS Cost Analysis

What it does:

• Discovers resources approaching or past End of Standard Support across all associated accounts (EKS, RDS, Lambda, ElastiCache, OpenSearch)
• Validates EOS dates and pricing against live AWS docs via verify_aws_claim
• Calculates per-resource Extended Support cost with Year 1/2/3 tiered pricing
• Produces a structured artifact with cost breakdown, urgency levels, and upgrade paths

How it works:

• Upload the skill → ask "What's my EOS cost exposure?" in regular Chat (no custom agent required)
• Optionally create a custom agent for scheduled weekly/monthly runs
• Uses only use_aws + verify_aws_claim — no custom MCP server or infra needed

Type of change

• [Y] New skill
• [Y] New custom agent
• Update to an existing skill or agent
• Documentation or infrastructure change

Testing

I created multiple accounts having multiple resources like RDS, Lambda and EKS. These resources are running in various version to ensure that skill is able to get the correct version and then flag only those which are running on EOS

License confirmation

• [Y] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache License 2.0.