[ISSUE #8065] Increase tiered storage destroy expired files interval to 30min

[bxfjb]

Which Issue(s) This PR Fixes

Fixes #8065

Brief Description

See #8065

How Did You Test This Change?

[codecov-commenter]

Codecov Report

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

Project coverage is 42.89%. Comparing base (9c8fdb7) to head (e60e21f).

Files	Patch %	Lines
...pache/rocketmq/tieredstore/file/FlatFileStore.java	0.00%	1 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8217      +/-   ##
=============================================
- Coverage      42.93%   42.89%   -0.05%     
+ Complexity     10377    10369       -8     
=============================================
  Files           1270     1270              
  Lines          88727    88727              
  Branches       11407    11407              
=============================================
- Hits           38095    38057      -38     
- Misses         45936    45964      +28     
- Partials        4696     4706      +10     

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