Fixing flakyness in MultipleSelect test

[olemartinorg]

Description

This test failed for me locally sometimes, and I suspect it's the same reason for why it failed in #3336 (cypress cloud link). Checking these values earlier makes Cypress wait until the value has been selected before proceeding.

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[olemartinorg]

Awaiting #3377 to see if that includes these changes instead.

[paal2707]

Closing, added this fix in #3377