Remove deprecated usage of Promise.pending

[flotwig]

• Closes Bluebird / Promise.js warning of deprecated Promise.defer from CircleCi #5571

User facing changelog

Fixed an issue where a warning about Promise.defer would appear in stderr when running with video recording enabled.

Additional details

only used in one place, replaced it with a small ez to understand function

[cypress-bot]

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PR Review Checklist

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User Experience

• The feature/bugfix is self-documenting from within the product.
• The change provides the end user with a way to fix their problem (no dead ends).

Functionality

• The code works and performs its intended function with the correct logic.
• Performance has been factored in (for example, the code cleans up after itself to not cause memory leaks).
• The code guards against edge cases and invalid input and has tests to cover it.

Maintainability

• The code is readable (too many nested 'if's are a bad sign).
• Names used for variables, methods, etc, clearly describe their function.
• The code is easy to understood and there are relevant comments explaining.
• New algorithms are documented in the code with link(s) to external docs (flowcharts, w3c, chrome, firefox).
• There are comments containing link(s) to the addressed issue (in tests and code).

Quality

• The change does not reimplement code.
• There's not a module from the ecosystem that should be used instead.
• There is no redundant or duplicate code.
• There are no irrelevant comments left in the code.
• Tests are testing the code’s intended functionality in the best way possible.

Internal

• The original issue has been tagged with a release in ZenHub.

[cypress]

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Test summary

3479 • 0 • 46 • 0

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Run details

Project	cypress
Status	Passed
Commit	7344bfa
Started	Nov 7, 2019 4:02 PM
Ended	Nov 7, 2019 4:06 PM
Duration	03:52 💡
OS	Linux Debian - 9.8
Browser	Multiple

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[cypress-bot]

Released in 3.6.1.