chore: provide OSSF security-insight

[mmorel-35]

Clomonitor requires a SECURITY-INSIGHTS.yml,
See https://clomonitor.io/projects/cncf/etcd#etcd_security

This was done with the help of https://github.com/ossf/security-insights-spec/tree/main/specification

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorel-35
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[k8s-ci-robot]

Hi @mmorel-35. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.62%. Comparing base (fd02589) to head (c797b74).
Report is 7 commits behind head on main.

Additional details and impacted files

see 17 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18940      +/-   ##
==========================================
- Coverage   68.78%   68.62%   -0.17%     
==========================================
  Files         420      420              
  Lines       35561    35561              
==========================================
- Hits        24462    24404      -58     
- Misses       9680     9727      +47     
- Partials     1419     1430      +11     

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