feat(pipelines): Support setting ELT_WRITE_DISPOSITION value in Ansible playbook (#164)

### Summary

The Ansible playbook can now set the mode for write_disposition in the
ELT cron jobs. For now Opralog is set to replace to ensure everything is
fresh until #138 is implemented.

Refs #138


<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

## Release Notes

* **Chores**
* Updated data warehouse configuration to support write disposition
settings with replace mode enabled for improved data handling.

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Author: martyngigg

infra/ansible-docker/playbooks/elt/elt_cron_tasks.yml

@@ -8,6 +8,7 @@
     job: >
       NO_COLOR=1 UV_NO_PROGRESS=1
       ELT_SECRETS={{ elt_secrets_root_dir }}/{{ warehouse.name }}/envvars
+      ELT_WRITE_DISPOSITION={{ source.write_disposition | default("") }}
       {{ elt_cron_root_dir }}/elt_task.sh
       https://github.com/{{ warehouse.github_org }}/{{ warehouse.github_repo }}.git
       {{ elt_git_clone_dir }}/{{ warehouse.github_org }}/{{ warehouse.github_repo }}

infra/ansible-docker/playbooks/elt/group_vars/elt.yml

@@ -29,6 +29,7 @@ elt_warehouses:
         hour: 2
         minute: 11
         dbt_args: "--select '+models/operations' --exclude '+models/operations/power_consumption.sql'"
+        write_disposition: "replace"
       - name: electricity_sharepoint
         hour: "*"
         minute: 5