scripts: simplify mod tidy pass

[ivanvc]

The original go mod tidy pass implementation was done before the --diff go mod option existed. This simplifies the implementation, as temporary files are no longer needed.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (3cf550d) to head (9d8f2fa).
Report is 4 commits behind head on main.

Additional details and impacted files

see 17 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19042      +/-   ##
==========================================
- Coverage   68.75%   68.68%   -0.08%     
==========================================
  Files         420      420              
  Lines       35623    35623              
==========================================
- Hits        24493    24467      -26     
- Misses       9709     9727      +18     
- Partials     1421     1429       +8     

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[ahrtr]

LGTM

Thanks for the cleanup.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, serathius

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