Fix Workspaces SettingsIntegrationSpec flakiness

What does this MR do and why?

Fix Workspaces SettingsIntegrationSpec flakiness.

This is the same fix as we did in Fix flakiness in current_settings_reader specs (!187996 - merged) • Chad Woolley • 18.0. See that MR for details.

References

• Fix flakiness in current_settings_reader specs (!187996 - merged) • Chad Woolley • 18.0

Screenshots or screen recordings

N/A.

How to set up and validate locally

This is an intermittent failure depending on spec order in suites, so it's not easily reproducible.

MR acceptance checklist

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