Fix Integration Tests

[aphralG]

Proposed changes

• Fix chunking integration tests, mock management plane now calls SendAndClose()
• Lint

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.91%. Comparing base (6bef50b) to head (b363dc7).
⚠️ Report is 1 commits behind head on ensure-stream-closed.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           ensure-stream-closed    #1523      +/-   ##
========================================================
- Coverage                 85.02%   84.91%   -0.12%     
========================================================
  Files                       103      103              
  Lines                     13588    13588              
========================================================
- Hits                      11553    11538      -15     
- Misses                     1518     1535      +17     
+ Partials                    517      515       -2     

Files with missing lines	Coverage Δ
internal/file/file_service_operator.go	77.53% <ø> (ø)

... and 5 files with indirect coverage changes

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