fix(features): disable CachePodLabelSelector and SandboxUpgradeResumeFromFailedStep by default

[zmberg]

Summary

• Disable CachePodLabelSelector feature gate by default (was enabled)
• Disable SandboxUpgradeResumeFromFailedStep feature gate by default (was enabled)

These two features are not yet stable enough for default-on behavior and should require explicit opt-in.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.66%. Comparing base (2b1118d) to head (122b109).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #554   +/-   ##
=======================================
  Coverage   79.66%   79.66%           
=======================================
  Files         194      194           
  Lines       13774    13774           
=======================================
  Hits        10973    10973           
  Misses       2403     2403           
  Partials      398      398           

Flag	Coverage Δ
unittests	79.66% <ø> (ø)

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