remove /dev/shm sandbox rule

[prandla]

this rule is now included in isolate's default rules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@29b33e6). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1722   +/-   ##
=======================================
  Coverage        ?   56.71%           
=======================================
  Files           ?      344           
  Lines           ?    28307           
  Branches        ?        0           
=======================================
  Hits            ?    16055           
  Misses          ?    12252           
  Partials        ?        0           

Flag	Coverage Δ
functionaltests	0.00% <ø> (?)
unittests	56.71% <ø> (?)

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