Disable secrets-outside-env audit

[martincostello]

This isn't appropriate in most cases as there's no logical environment, and environments are already used in cases where they are.

[Copilot]

Pull request overview

This PR disables the secrets-outside-env zizmor audit rule in the project's CI security linting configuration. The repository uses GitHub Actions secrets in many workflows where GitHub Environments don't logically apply (e.g., Codecov tokens, bot app credentials), and environments are already used where they make sense (Azure signing, NuGet publishing).

Changes:

• Added secrets-outside-env: disable: true to the zizmor configuration file to suppress false positives from this audit rule.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (6da1b79) to head (864991d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2969   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         309      309           
  Lines        7128     7128           
  Branches     1005     1005           
=======================================
  Hits         6854     6854           
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <ø> (ø)
macos	96.15% <ø> (ø)
windows	96.14% <ø> (ø)

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