fix: use require.NoError instead of t.Fatal(err) in contrib and tools packages

[mmorel-35]

Description

This uses testify instead of testing for
With

require.NoError(t, err)

require.Error(t, err)

instead of

if err != nil {
    t.Fatal(err)
}


if err == nil {
    t.Fatal(err)
}

Related to #18972

[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 Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.73%. Comparing base (3d6ff97) to head (fa7efc9).

❗ Current head fa7efc9 differs from pull request most recent head 63dad79

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Additional details and impacted files

see 29 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18752      +/-   ##
==========================================
- Coverage   68.77%   68.73%   -0.05%     
==========================================
  Files         420      420              
  Lines       35501    35501              
==========================================
- Hits        24416    24400      -16     
- Misses       9657     9670      +13     
- Partials     1428     1431       +3     

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[ahrtr]

LGTM

Note the we are going to remove raftexample once etcd-io/raft#2 is resovled.

[ahrtr]

/ok-to-test

[fuweid]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid, mmorel-35

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