Added new and open status duration metrics in business minutes

[Tim-Hoare]

Are you a current Fivetran customer?
Yes: Tim Hoare, Data Scientist @ Codat

What change(s) does this PR introduce?
This adds a couple of new columns to the ticket metrics model, that are durations in business minutes that tickets are in the "new" and "open" status. These are counterparts to existing columns that are in calendar minutes

Did you update the CHANGELOG?

• Yes

Does this PR introduce a breaking change?

• Yes (please provide breaking change details below.)
• No (please provide an explanation as to how the change is non-breaking below.)

I don't believe this is a breaking change as there are only new columns being added

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• Yes

Is this PR in response to a previously created Bug or Feature Request

• Yes, Issue/Feature [link bug/feature number here]
• No

How did you test the PR changes?

• Buildkite
• Local (please provide additional testing details below)

I made the changes locally and ran dbt run --select zendesk. All of these ran successfully and I can see that the new columns were added in the table in the database, with the desired output

Select which warehouse(s) were used to test the PR

• BigQuery
• Redshift
• Snowflake
• Postgres
• Databricks
• Other (provide details below)

Provide an emoji that best describes your current mood

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[fivetran-joemarkiewicz]

Hi @Tim-Hoare thanks so much for taking the time to open this PR to incorporate the new and open duration business minutes!

After doing a cursory review of your PR I feel this looks good and is a natural extension of the existing duration business minutes. I will plan to do a more thorough review early next week and will plan to include these changes in our next release that will also include the changes from PR #94.

One request before jumping in further would be if you would be able to include the two new metrics you added as yml descriptions within the zendesk.yml file. This will ensure we properly include the field definitions for users to understand how to interpret these fields. Let me know if you have any other questions. Thanks again!

[fivetran-joemarkiewicz]

Additionally, if you wanted to give the branch with the PR #94 changes to confirm you see your expected output that would be a huge help! If you wanted, you can test that branch by using the following in your packages.yml

packages:
  - git: https://github.com/fivetran/dbt_zendesk.git
    revision: bugfix/schedule-holiday-addition ## In place of your existing package version for Zendesk
    warn-unpinned: false 

This branch essentially includes holidays within ticket schedules. If you do not use holidays then you should see no change. I am just looking to get confirmation on the expected behavior before rolling these changes out. Let me know if you are able to test. If not, no worries at all. Thanks 😄

[fivetran-joemarkiewicz]

@Tim-Hoare thanks for working through the updates and contributing your changes to the package! I just made a few minor edits to ensure your branch will be able to be merged into our release branch.

We are planning to roll this out in the coming week. Thank you again for your contribution!