Configure Dependabot to group testcontainers dependency updates

[Copilot]

Overview

This PR configures Dependabot to group all org.testcontainers:* dependency updates into a single pull request, preventing the creation of multiple separate PRs for related testcontainers updates.

Problem

Recently, Dependabot created separate pull requests for testcontainers dependency updates:

• PR Bump org.testcontainers:testcontainers from 2.0.0 to 2.0.1 #4508: Bump org.testcontainers:testcontainers from 2.0.0 to 2.0.1
• PR Bump org.testcontainers:testcontainers-bom from 1.21.3 to 2.0.1 #4506: Bump org.testcontainers:testcontainers-bom from 1.21.3 to 2.0.1

This resulted in multiple PRs that needed to be reviewed and merged separately, increasing maintenance overhead and making it harder to ensure all testcontainers versions stay in sync.

Solution

Added a groups configuration to .github/dependabot.yml for the main Gradle package ecosystem:

groups:
  testcontainers:
    patterns:
      - "org.testcontainers:*"

This configuration instructs Dependabot to group all dependency updates matching the pattern org.testcontainers:* into a single pull request.

Impact

Going forward, all testcontainers dependency updates will be combined into one PR, including:

• org.testcontainers:testcontainers
• org.testcontainers:testcontainers-bom
• org.testcontainers:testcontainers-kafka
• Any other testcontainers modules

Benefits

• Reduced PR overhead: One grouped PR to review instead of multiple individual PRs
• Atomic updates: All related testcontainers dependencies update together, ensuring compatibility
• Easier review: All changes in one place for simpler comparison and testing
• Version consistency: Ensures all testcontainers versions stay in sync across the project

Testing

• ✅ YAML syntax validated
• ✅ Configuration structure verified
• ✅ Pattern matching tested against all known testcontainers dependencies in the repository

Original prompt

group dependabot updates for

@microsoft/ApplicationInsights-Java/pull/4508
and
@microsoft/ApplicationInsights-Java/pull/4506

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