fix(qrm): fix printing of numa mem migrate container stats

[gary-lgy]

What type of PR is this?

Bug fix

What this PR does / why we need it:

Fix getting numa memory stats under cgroup v1.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 20.68966% with 23 lines in your changes missing coverage. Please review.

Project coverage is 56.27%. Comparing base (0a3785c) to head (e2eee22).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
...ins/memory/dynamicpolicy/policy_advisor_handler.go	0.00%	9 Missing ⚠️
pkg/util/cgroup/manager/v1/fs_linux.go	0.00%	7 Missing ⚠️
pkg/util/cgroup/manager/v2/fs_linux.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #710      +/-   ##
==========================================
+ Coverage   55.86%   56.27%   +0.40%     
==========================================
  Files         573      594      +21     
  Lines       66777    68007    +1230     
==========================================
+ Hits        37307    38268     +961     
- Misses      25489    25695     +206     
- Partials     3981     4044      +63     

Flag	Coverage Δ
unittest	56.27% <20.68%> (+0.40%)	⬆️

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