chore(execd): complete the work for #332, and fix the linter errors.

[Pangjiping]

Summary

• complete the work for feat: add uid and gid support for command execution #332
• execd's work for FEATURE: support declaring uid and gid when running commands. #178
• remaining work for fix(execd): Add fallback from bash to sh for Alpine-based images #407 and closes Add a fallback to use sh instead of hardcoded bash #405
• add support env in run command request
• refactor unit tests to testify require/assert

Testing

• Not run (explain why)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[jwx0925]

@codex review

[chatgpt-codex-connector]

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[hittyt]

LGTM