fix: use pod pvs to list mound pods

[zxh326]

fix: #854

• Remove pod mount pods annotation
• Use pods pvs to list mount pods in dashboard pods api

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (c1bebcb) 29.20% compared to head (8313922) 29.26%.

Files	Patch %	Lines
pkg/dashboard/pod.go	0.00%	7 Missing ⚠️
pkg/juicefs/mount/pod_mount.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #857      +/-   ##
==========================================
+ Coverage   29.20%   29.26%   +0.06%     
==========================================
  Files          46       46              
  Lines        5654     5641      -13     
==========================================
  Hits         1651     1651              
+ Misses       3842     3829      -13     
  Partials      161      161              

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