[Bug] VX-280: GetContainer API should require pod name

[WakeupTsai]

This PR will effect the front-end, please make sure front-end also merge the relative PR.

[codecov-io]

Codecov Report

Merging #282 into develop will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #282      +/-   ##
===========================================
+ Coverage    78.57%   78.61%   +0.03%     
===========================================
  Files           60       60              
  Lines         3361     3339      -22     
===========================================
- Hits          2641     2625      -16     
+ Misses         547      543       -4     
+ Partials       173      171       -2

Impacted Files	Coverage Δ
src/prometheuscontroller/controller.go	86.71% <100%> (ø)	⬆️
src/server/route.go	84.55% <100%> (-0.13%)	⬇️
src/server/handler_prometheus.go	65.57% <100%> (-0.86%)	⬇️

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[John-Lin]

linkernetworks/vortex-portal#16