fix(compute): remove sponge dependency from update_discovery_doc script

[colinmoy]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates generator/discovery/update_discovery_doc.sh to use local variables and replaces the sponge command with a temporary file using mktemp and mv. The review feedback suggests creating the temporary file in the same directory as the target file to ensure that the mv operation is atomic and avoids cross-filesystem copy overhead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.27%. Comparing base (73bb942) to head (709f5f4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16425   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files        2246     2246           
  Lines      212584   212584           
=======================================
+ Hits       196169   196171    +2     
+ Misses      16415    16413    -2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.