Fix flaky date-time test failures on GitHub

[Pezmc]

Description

It seems some of the test runners on GitHub use non-breaking spaces to separate parts of the time when formatted with locale:

May 17, 2022 at 1:39\u202fPM

This PR updates the relevant tests to normalize all whitespace, so the tests pass in all environments.

Related Issue(s)

Discovered first in #1727

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• [-] Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• [-] Changes flowforge.yml?
  • Issue/PR raised on flowforge/helm to update ConfigMap Template
  • Issue/PR raised on flowforge/CloudProject to update values for Staging/Production

Labels

• [-] Backport needed? -> add the backport label
• [-] Includes a DB migration? -> add the area:migration label