fix bugs to trim container id in pod spec

[waynepeking348]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

when fetching metrics, we should trim the container id in pod spec (for malachite interface)

[codecov]

Codecov Report

Patch coverage: 90.00% and project coverage change: -0.45% ⚠️

Comparison is base (83bce0c) 51.74% compared to head (aab8a4a) 51.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   51.74%   51.30%   -0.45%     
==========================================
  Files         421      421              
  Lines       40641    40666      +25     
==========================================
- Hits        21031    20863     -168     
- Misses      17307    17521     +214     
+ Partials     2303     2282      -21     

Flag	Coverage Δ
unittest	51.30% <90.00%> (-0.45%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...metaserver/agent/metric/malachite/client/client.go	100.00% <ø> (ø)
pkg/util/cgroup/common/path.go	85.91% <80.00%> (-2.02%)	⬇️
...server/agent/metric/malachite/client/client_pod.go	80.85% <100.00%> (+6.56%)	⬆️

... and 22 files with indirect coverage changes

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