fix: Fix flaky test

[sanjayprabhu]

Why is this change needed?

Fix flaky timestamp test that was relying expiry instead of blockTimestamp for storage rent.

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PR-Codex overview

The focus of this PR is to update the storage cache test by adjusting the values of units and legacy_units.

Detailed summary

• Updated units and legacy_units values in the storage cache test
• Added blockTimestamp to storageRentEvent

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Latest commit: d06d182

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Name	Status	Preview	Comments	Updated (UTC)
hub-monorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 16, 2024 9:25pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.43%. Comparing base (1880070) to head (d06d182).
Report is 350 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2314       +/-   ##
===========================================
- Coverage   74.05%   44.43%   -29.63%     
===========================================
  Files          99      146       +47     
  Lines        9425    25563    +16138     
  Branches     2097     9164     +7067     
===========================================
+ Hits         6980    11358     +4378     
- Misses       2327    12391    +10064     
- Partials      118     1814     +1696     

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