remove _counter in metrics name for counter type

[yeya24]

Signed-off-by: yeya24 yb532204897@gmail.com

Ⅰ. Describe what this PR did

Currently pouch has some counter type metrics. But they all use suffix _counter_total. I think we should change these suffix to _total.
It is OK to just use _total here and it can represent counter. So this _counter is useless and should be removed.

Ⅱ. Does this pull request fix one issue?

None

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2865 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2865      +/-   ##
==========================================
- Coverage   69.09%   69.09%   -0.01%     
==========================================
  Files         285      285              
  Lines       17844    17844              
==========================================
- Hits        12330    12329       -1     
+ Misses       4114     4113       -1     
- Partials     1400     1402       +2

Flag	Coverage Δ
#criv1alpha2_test	38.95% <ø> (-0.06%)	⬇️
#integration_test_0	36.58% <ø> (+0.01%)	⬆️
#integration_test_1	35.76% <ø> (ø)	⬆️
#integration_test_2	36.48% <ø> (+0.01%)	⬆️
#integration_test_3	35.48% <ø> (+0.02%)	⬆️
#node_e2e_test	34.77% <ø> (ø)	⬆️
#unittest	28.53% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pkg/utils/metrics/metrics.go	100% <ø> (ø)	⬆️
apis/metrics/metrics.go	100% <ø> (ø)	⬆️
ctrd/watch.go	72.97% <0%> (-5.41%)	⬇️
pkg/meta/store.go	67.44% <0%> (-1.56%)	⬇️
daemon/mgr/container_utils.go	76.76% <0%> (-1.02%)	⬇️
ctrd/container.go	54.3% <0%> (+0.38%)	⬆️
ctrd/supervisord/daemon.go	50.67% <0%> (+1.35%)	⬆️
cri/ocicni/netns.go	60.81% <0%> (+2.7%)	⬆️

[pouchrobot]

We found this is your first time to contribute to pouch, @yeya24
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻