fix(webex): fix numerous missing awaits in unit tests

[Coread]

COMPLETES #< INSERT LINK TO ISSUE >

This pull request addresses

assert.isRejected needs to be awaited/returned in non async tests.

by making the following changes

Fix all the cases where isRejected is not awaited/returned

Change Type

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update
• [ ] Tooling change
• [ ] Internal code refactor

The following scenarios were tested

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

I certified that

• [ ] I have read and followed contributing guidelines

• [ ] I discussed changes with code owners prior to submitting this pull request

• [ ] I have not skipped any automated checks

• [ ] All existing and new tests passed

• [ ] I have updated the documentation accordingly

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Make sure to have followed the contributing guidelines before submitting.