CPLAT-6464 Improve error message for props/state variables with initializers

[greglittlefield-wf]

Motivation

How would one initialize a list field of a class?

I have

@State()
class _$FooState extends UiState {
  List<ReactElement> inputs = [];
}

But get an error Fields are stubs for generated setters/getters and should not have initializers.. > If I remove the = [], i get errors claiming the list is null everywhere, so I’m not sure where to initialize it.

This error message could be better, and indicate how to initialize these values.

Changes

In error message, add note on where to initialize values

Release Notes

Improve error message for props/state variables with initializers

Review

See CONTRIBUTING.md for more details on review types (+1 / QA +1 / +10) and code review process.

Please review:

QA Checklist

• Tests were updated and provide good coverage of the changeset and other affected code
• Manual testing was performed if needed
  • Anything falling under manual testing criteria outlined in CONTRIBUTING.md

Merge Checklist

While we perform many automated checks before auto-merging, some manual checks are needed:

• A Client Platform member has reviewed these changes
• There are no unaddressed comments - this check can be automated if reviewers use the "Request Changes" feature
• For release PRs - Version metadata in Rosie comment is correct

[aviary3-wk]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[greglittlefield-wf]

This was renamed so I could use the type argument above without it being shadowed here.

[kealjones-wk]

you answered my feedback before i could leave it... damn you

[kealjones-wk]

QA +1

[greglittlefield-wf]

@Workiva/release-management-pp