CCM-16002 - Dependabot grouping to cut down on PRs

[mjewildnhs]

Description

Add Dependabot groups to the pnpm ecosystem entry in .github/dependabot.yaml. Groups batch related package updates into a single PR rather than one per package:

• aws-sdk — all @aws-sdk/* packages
• eslint — ESLint core, plugins, and TypeScript ESLint packages
• jest — Jest, ts-jest, and @types/jest
• typescript — TypeScript compiler, ts-node, tsx, and @tsconfig/*

Context

AWS SDK packages (client-cloudwatch, client-s3, client-sqs, etc.) always release together with the same version, generating one Dependabot PR per package. Grouping them into a single PR reduces noise. The same logic applies to the tightly-coupled ESLint, Jest, and TypeScript toolchain packages.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.