#18 Optimize unit tests for apps/staking

[nevendyulgerov]

Optimized speed of unit tests for apps/staking by refactoring imports.

Before the changes:

After the changes:

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
rollups	✅ Ready (Inspect)	Visit Preview		Jun 29, 2023 2:55pm
staking	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 29, 2023 2:55pm

[coveralls]

Pull Request Test Coverage Report for Build 5413676420

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.752%

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Totals
Change from base Build 5372965490:	0.0%
Covered Lines:	2548
Relevant Lines:	3337

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💛 - Coveralls