[FOLLOWUP] Remove unused methods in Storage interface

[zuston]

What changes were proposed in this pull request?

1. Remove unused methods in Storage interface

Why are the changes needed?

1. Remove it to make more clear.

Does this PR introduce any user-facing change?

No

How was this patch tested?

Don't need

[jerqi]

LGTM, thanks @zuston

[codecov-commenter]

Codecov Report

Merging #431 (d81b5c3) into master (4bd3af6) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #431      +/-   ##
============================================
+ Coverage     58.44%   58.52%   +0.07%     
  Complexity     1613     1613              
============================================
  Files           195      195              
  Lines         11057    11042      -15     
  Branches        976      973       -3     
============================================
  Hits           6462     6462              
+ Misses         4217     4202      -15     
  Partials        378      378              

Impacted Files	Coverage Δ
...apache/uniffle/storage/common/AbstractStorage.java	51.35% <ø> (+5.00%)	⬆️
...org/apache/uniffle/storage/common/HdfsStorage.java	0.00% <ø> (ø)
...rg/apache/uniffle/storage/common/LocalStorage.java	45.89% <ø> (+2.66%)	⬆️

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