fix app pod label and annotation when using multi pvcs

[zwwhdls]

fix #728

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.11% ⚠️

Comparison is base (4a5b74f) 38.25% compared to head (0c4d648) 38.15%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #732      +/-   ##
==========================================
- Coverage   38.25%   38.15%   -0.11%     
==========================================
  Files          33       33              
  Lines        4078     4089      +11     
==========================================
  Hits         1560     1560              
- Misses       2371     2382      +11     
  Partials      147      147              

Files Changed	Coverage Δ
pkg/controller/pod_controller.go	0.00% <0.00%> (ø)
pkg/juicefs/mount/pod_mount.go	34.54% <0.00%> (-0.19%)	⬇️
pkg/k8sclient/client.go	15.17% <0.00%> (ø)

... and 1 file with indirect coverage changes

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