store: close accessor in GetRow and GetRangeNamespaceData

[phrwlk]

Ensures AccessorStreamer obtained via Store.GetByHeight is always closed in GetRow and GetRangeNamespaceData. Without closing, ref-counted accessors in the cache may leak references and file descriptors, preventing proper eviction and leading to resource leaks. This change aligns these methods with the existing pattern used in GetSamples, GetEDS, and GetNamespaceData.

[Wondertan]

Can you fix linter issue @phrwlk ?

[codecov-commenter]

Codecov Report

:x: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 35.36%. Comparing base (2469e7a) to head (4eece8a). :warning: Report is 586 commits behind head on main.

Files with missing lines	Patch %	Lines
store/getter.go	50.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4575      +/-   ##
==========================================
- Coverage   44.83%   35.36%   -9.48%     
==========================================
  Files         265      304      +39     
  Lines       14620    24323    +9703     
==========================================
+ Hits         6555     8601    +2046     
- Misses       7313    14771    +7458     
- Partials      752      951     +199     

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[phrwlk]

Can you fix linter issue @phrwlk ?

fixed lint @Wondertan