Add new solve time metrics

[fivetran-avinash]

PR Overview

This PR will address the following Issue/Feature: #119

This PR will result in the following new package version: v0.12.1

We are adding new fields, but they should not impact existing customers and their data.

Please provide the finalized CHANGELOG entry which details the relevant changes included in this PR:

🚀 Feature Updates 🚀

• Added solve_time_in_calendar_minutes and solve_time_in_business_minutes to our zendesk__ticket_metrics model, which calculates calendar and business minutes for when the ticket was in the 'new', 'open', 'hold', or 'pending' status.

🔎 Under the Hood 🔎

• Updates to the seed files and seed file configurations for the package integration tests to align with changes introduced by the PR on dbt_zendesk_source in applying the dbt_utils.star macro PR #42.

PR Checklist

Basic Validation

Please acknowledge that you have successfully performed the following commands locally:

• [x] dbt run –full-refresh && dbt test
• [NA] dbt run (if incremental models are present)

Before marking this PR as "ready for review" the following have been applied:

• [x] The appropriate issue has been linked, tagged, and properly assigned
• [x] All necessary documentation and version upgrades have been applied
• [x] docs were regenerated (unless this PR does not include any code or yml updates)
• [x] BuildKite integration tests are passing
• [x] Detailed validation steps have been provided below

Detailed Validation

Please share any and all of your validation steps: (Sharing via Slack)