ensure v3 endpoint has appropriate `_deleted` field

[fivetran-jamie]

PR Overview

This PR will address the following Issue/Feature:

no issue made, i just noticed that the Service ERD has ticket.is_deleted in v2 of the endpoint and ticket._fivetran_deleted in v3 https://docs.google.com/presentation/d/1OIPFpkqkSYAPPFfq1-yICdfArg6mmG71P-cm15cpy7U/edit#slide=id.ged1442628e_0_0 vs https://docs.google.com/presentation/d/12IRX0kbZM18vus2tr7MUp9MXSvGVn93QCnPnrgNIAhA/edit#slide=id.ged1442628e_0_0

This PR will result in the following new package version:

0.12.1

Please detail what change(s) this PR introduces and any additional information that should be known during the review of this PR:

• added _fivetran_deleted to the get_ticket_columns() macro
• folded in _fivetran_deleted in the staging model and coalesce it with the old field is_deleted

PR Checklist

Basic Validation

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

• [x] dbt compile
• [x] dbt run –full-refresh
• [x] dbt run
• [x] dbt test
• [x] dbt run –vars (if applicable)

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

• [ ] The appropriate issue has been linked and tagged
• [ ] You are assigned to the corresponding issue and this PR
• [x] BuildKite integration tests are passing

Detailed Validation

Please acknowledge that the following validation checks have been performed prior to marking this PR as "ready for review":

• [x] You have validated these changes and assure this PR will address the respective Issue/Feature.
• [x] You are reasonably confident these changes will not impact any other components of this package or any dependent packages.
• [x] You have provided details below around the validation steps performed to gain confidence in these changes.

ran dbt test before and after making the change and everything still succeeds. moreover, there's no fanout in downstream ticket models

Standard Updates

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• Package versioning has been appropriately indexed in the following locations:
  • [x] indexed within dbt_project.yml
  • [x] indexed within integration_tests/dbt_project.yml
• [x] CHANGELOG has individual entries for each respective change in this PR
• [x] README updates have been applied (if applicable)
• [ ] DECISIONLOG updates have been updated (if applicable)
• [x] Appropriate yml documentation has been added (if applicable)

dbt Docs

Please acknowledge that after the above were all completed the below were applied to your branch:

• [x] docs were regenerated (unless this PR does not include any code or yml updates)

If you had to summarize this PR in an emoji, which would it be?

💆