fix: config file validator missed the file tail validation

[tedxu]

See: #32168

[mergify]

@tedxu Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[mergify]

@tedxu go-sdk check failed, comment rerun go-sdk can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.08%. Comparing base (2630717) to head (a6c459a).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37608      +/-   ##
==========================================
- Coverage   68.15%   68.08%   -0.08%     
==========================================
  Files         290      290              
  Lines       25392    25902     +510     
==========================================
+ Hits        17306    17635     +329     
- Misses       8086     8267     +181     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	68.08% <ø> (-0.08%)	⬇️
Go	∅ <ø> (∅)

see 8 files with indirect coverage changes

[foxspy]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, tedxu

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• cmd/OWNERS [congqixia]
• configs/OWNERS [congqixia]
• pkg/util/OWNERS [congqixia]

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