Fix flaky test: plugin/storage/badger/samplingstore

[akagami-harsh]

Which problem is this PR solving?

• Resolves [Bug] Flaky test: plugin/storage/badger/samplingstore #5090

Description of the changes

• fixed flaky test
• fixed a small typo

[github-actions]

Test Results

2 086 tests  ±0   2 076 ✅ ±0   1m 8s ⏱️ -1s
  220 suites ±0      10 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit a91d7e5. ± Comparison against base commit 09f7a30.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b9f614c) 95.56% compared to head (a91d7e5) 95.55%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5094      +/-   ##
==========================================
- Coverage   95.56%   95.55%   -0.02%     
==========================================
  Files         319      319              
  Lines       18376    18379       +3     
==========================================
+ Hits        17561    17562       +1     
- Misses        654      655       +1     
- Partials      161      162       +1     

Flag	Coverage Δ
cassandra-3.x	25.59% <ø> (ø)
cassandra-4.x	25.59% <ø> (ø)
elasticsearch-5.x	19.86% <ø> (ø)
elasticsearch-6.x	19.87% <ø> (ø)
elasticsearch-7.x	20.01% <ø> (ø)
elasticsearch-8.x	20.10% <ø> (ø)
grpc-badger	19.52% <100.00%> (ø)
kafka	14.10% <ø> (ø)
opensearch-1.x	20.01% <ø> (ø)
opensearch-2.x	20.01% <ø> (ø)
unittests	93.24% <100.00%> (-0.01%)	⬇️

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