build: strip sqlness binary

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Debug info is unnecessary to sqlness-runner. Omit it to save space for CI (https://github.com/GreptimeTeam/greptimedb/actions/runs/8980727729/job/24665718225)

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.26%. Comparing base (154f561) to head (34d9dc1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3872      +/-   ##
==========================================
- Coverage   85.60%   85.26%   -0.34%     
==========================================
  Files         952      952              
  Lines      163079   163079              
==========================================
- Hits       139596   139047     -549     
- Misses      23483    24032     +549