fix spd cache clear when checkpoint deleted

[luomingmeng]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

fix spd cache clear when checkpoint deleted

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 56.68%. Comparing base (4858a44) to head (393f4d0).
Report is 3 commits behind head on main.

❗ Current head 393f4d0 differs from pull request most recent head 0f4d219

Please upload reports for the commit 0f4d219 to get more accurate results.

Files	Patch %	Lines
pkg/metaserver/spd/cache.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   56.75%   56.68%   -0.07%     
==========================================
  Files         545      545              
  Lines       51537    51538       +1     
==========================================
- Hits        29248    29213      -35     
- Misses      18583    18632      +49     
+ Partials     3706     3693      -13     

Flag	Coverage Δ
unittest	56.68% <0.00%> (-0.07%)	⬇️

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