Exclude expression validations from backend

[bjosttveit]

Description

I noticed that the expression-validation tests were a bit flaky, and it turns out I forgot to exclude expression validations from the backend in the original PR 🤦 . This was not an issue in normal use since the frontend and backend seem to always agree on what is valid and what is not. But it looks like there are some subtleties when it comes to saving delay triggering single field validations and repeating group triggered validations that could cause a mismatch if the order of requests was unlucky, due to cypress being very fast. This should hopefully fix the flakyness.

Related Issue(s)

• Expression validation #1540

Verification/QA

• Manual functionality testing
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  • I have tested with a screen reader/keyboard navigation/automated wcag validator
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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

50.0% Coverage
0.0% Duplication

[olemartinorg]

Ahhh, hoping this is the root cause of the strangeness I'm seeing currently! 🙏