feat(github-workflows): add support for Dependabot exclude paths

[DecSmith42]

Extended DependabotOptions with an ExcludePaths property, enabling exclusion of specific paths in Dependabot workflow generation. Updated DependabotWorkflowWriter to handle the new exclude-paths section when applicable.

[Copilot]

Pull request overview

This PR adds support for excluding specific paths in Dependabot configuration by introducing an ExcludePaths property to the DependabotUpdate record and implementing the corresponding YAML generation logic.

Changes:

• Extended DependabotUpdate with an ExcludePaths property to allow specifying paths to exclude from Dependabot monitoring
• Updated DependabotWorkflowWriter to generate the exclude-paths section in the Dependabot YAML configuration when paths are specified

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
DecSm.Atom.Module.GithubWorkflows/Generation/Options/DependabotOptions.cs	Added ExcludePaths property to DependabotUpdate record with empty collection initializer
DecSm.Atom.Module.GithubWorkflows/Generation/DependabotWorkflowWriter.cs	Added YAML generation logic for exclude-paths section with conditional rendering based on collection count

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