[⚡esl-utils]: improve tests speed and quality for `src/modules/esl-utils/async/aggregate.ts`

[ala-n]

Scope:

• make sure jest fake timers technology is used
• extend test cases
• make sure there is no fake coverage

Module:

• src/modules/esl-utils/async/aggregate.ts

[ala-n]

:tada: This issue has been resolved in version 5.0.0-beta.1 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[ala-n]

:tada: This issue has been resolved in version 4.15.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: