[CI] Stop tracking CI jobs as deployments

[komer3]

General

• Sensitive information removed.
• Checked for duplicate pull requests.

Pull Request Guidelines

• Tests not run; this workflow-only change was checked with actionlint.
• Single CI change in one atomic commit.
• Rationale: deployment: false stops these CI jobs from creating deployment noise while preserving environment secrets and reviewer approvals.

GitHub documentation: https://docs.github.com/en/actions/how-tos/deploy/configure-and-manage-deployments/control-deployments#using-environments-without-deployments

[AshleyDumaine]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.50%. Comparing base (5b8dcb1) to head (385dd47).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #639   +/-   ##
=======================================
  Coverage   82.50%   82.50%           
=======================================
  Files          19       19           
  Lines        2600     2600           
=======================================
  Hits         2145     2145           
  Misses        455      455           

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