chore(ci): Use repo variables for non-sensitive config

[neo-jesse]

chore(ci): Use repo variables for non-sensitive config

Summary:

• Use GitHub Actions variables instead of secrets for: SENTRY_ORG, SENTRY_PROJECT, MIXPANEL_INGEST_USER, OT_APP_APPLE_ID_V2.
• Updated workflows: pd-test-build-deploy.yaml, app-test-build-deploy.yaml, odd-memory-usage-test.yaml.
• These values are not highly sensitive; variables allow default values and clearer visibility in the UI. Add the same names under Settings → Actions → Variables and remove the corresponding secrets once variables are in place.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.56%. Comparing base (98e7813) to head (73a87f2).
⚠️ Report is 44 commits behind head on edge.

Additional details and impacted files

@@            Coverage Diff             @@
##             edge   #21037      +/-   ##
==========================================
- Coverage   57.20%   56.56%   -0.65%     
==========================================
  Files        3987     4026      +39     
  Lines      326739   333752    +7013     
  Branches    46475    47262     +787     
==========================================
+ Hits       186908   188776    +1868     
- Misses     139612   144747    +5135     
- Partials      219      229      +10     

Flag	Coverage Δ
app	45.16% <ø> (+0.22%)	⬆️
protocol-designer	19.94% <ø> (ø)

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see 394 files with indirect coverage changes

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