Configure Dependabot to batch Microsoft.Build.* dependency updates

[Copilot]

Group all Microsoft.Build.* dependency updates into a single PR instead of creating separate PRs for each package.

Changes

• Added groups configuration to .github/dependabot.yml for the NuGet ecosystem
• Configured microsoft-build-deps group with pattern Microsoft.Build.*

groups:
  microsoft-build-deps:
    patterns:
      - "Microsoft.Build.*"

This reduces PR noise when Microsoft.Build packages are updated together.

Original prompt

Add a batch group configuration to Dependabot so that all PRs for dependencies matching "Microsoft.Build.*" are created as a single grouped PR. This involves editing or creating the .github/dependabot.yml file in the repository and adding a groups section under the appropriate updates entry for the NuGet ecosystem. The configuration should look like:

version: 2
updates:

• package-ecosystem: "nuget"
  directory: "/"
  schedule:
  interval: "weekly"
  groups:
  microsoft-build-deps:
  patterns:
  - "Microsoft.Build.*"

If the file exists, append the group config to the NuGet updates entry. If not, create it with this config.

This pull request was created as a result of the following prompt from Copilot chat.

Add a batch group configuration to Dependabot so that all PRs for dependencies matching "Microsoft.Build.*" are created as a single grouped PR. This involves editing or creating the .github/dependabot.yml file in the repository and adding a groups section under the appropriate updates entry for the NuGet ecosystem. The configuration should look like:

version: 2
updates:

• package-ecosystem: "nuget"
  directory: "/"
  schedule:
  interval: "weekly"
  groups:
  microsoft-build-deps:
  patterns:
  - "Microsoft.Build.*"

If the file exists, append the group config to the NuGet updates entry. If not, create it with this config.

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