Add Update Cooldown Parameters to Dependabot CLI

[kbukum1]

Summary

This PR adds support for update cooldown parameters in the Dependabot CLI. The cooldown settings allow users to configure delays between dependency updates based on semantic versioning rules.

Changes Introduced

• Added a new cooldown field to the Job struct in model/job.go, allowing users to specify cooldown settings.
• Updated YAML unmarshaling and struct mapping to support the new cooldown parameters.
• Enhanced test coverage in job_test.go to validate parsing of cooldown settings from YAML.
• Ensured backward compatibility by making cooldown an optional field (omitempty).

New Cooldown Parameters

• default-days: Default cooldown period for all updates.
• semver-major-days: Cooldown period for major updates.
• semver-minor-days: Cooldown period for minor updates.
• semver-patch-days: Cooldown period for patch updates.
• include: List of dependencies explicitly included in cooldown rules.
• exclude: List of dependencies excluded from cooldown rules.

Why This Change?

• Allows users to reduce update noise by spacing out dependency updates.
• Provides fine-grained control over update schedules.
• Helps teams better manage dependency upgrades without overwhelming PRs.

Testing Done

• Added unit tests to job_test.go to validate cooldown parameters parsing.
• Verified correct mapping of YAML fields to the Job struct.
• Ran go test ./... to ensure all tests pass.