Attempt to fix a crash that could occur when formatting dates and times

[hichamboushaba]

Closes: #13390

Description

This PR is an attempt to fix the linked crash, the above crash happens when we try to format dates, and looking online lead me to this StackOverflow answer https://stackoverflow.com/a/18383395, which matches our case, as we are using the same SimpleFormatDate instances for the whole lifetime of DateUtils class, and multi-threading is involved (for example with the paging library in OrderListItemDataSource).

I tried to reproduce the crash manually by making multiple concurrent calls, but I failed, but I think this fix by using computed properties should fix the crash, as we'll use each instance just once.

Steps to reproduce

Just a quick check of the top-level screens should be enough.

Testing information

Tested and confirmed no regression.

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	c98ba62
	Direct Download	woocommerce-wear-prototype-build-pr13393-c98ba62.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	c98ba62
	Direct Download	woocommerce-prototype-build-pr13393-c98ba62.apk

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.10%. Comparing base (73135c1) to head (c98ba62).
Report is 4 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #13393   +/-   ##
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  Coverage     41.10%   41.10%           
  Complexity     6486     6486           
=========================================
  Files          1325     1325           
  Lines         77572    77572           
  Branches      10694    10694           
=========================================
  Hits          31889    31889           
  Misses        42850    42850           
  Partials       2833     2833           

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[irfano]

Great find, @hichamboushaba! LGTM! 👍🏻