FED-734 CI cleanup: remove failing stable config, add 2.18 config

[greglittlefield-wf]

Motivation

• The GitHub Actions "build" job, which is our main set of CI checks, hasn't only been running on 2.13.4 for a long time, and nothing newer. I'd really like to include a build for 2.18
• The "validate_analyzer" job is failing on Dart stable due to a Dart SDK bug that we're unable to work around at this time, so we want to disable it.

Changes

• Add 2.18.7 to the build matrix, since it's the latest Dart SDK version we can build with
  • Fix test failures in newer SDKs
  • Ignore part_of_different_library errors
  • Upgrade mockito since it older versions were causing build failures (merge in Upgrade to mockito v5 #789) - thanks @evanweible-wf!
  • Fix usages of the dartanalyzer command removed in newer SDKs
  • Fix VM test command to not use build_runner
  • Update built_redux/mockito generated file checks to only run in 2.18.7
• Remove validate_analyzer config, since it isn't needed once Raise analyzer minimum & unpin meta #804 constrains our analyzer dependency to a single major version
  • We can reinstate this if we ever need to support multiple versions again in the future

Release Notes

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
  • Steps from PR author:
    • CI passes
  • 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 Frontend Frameworks Design 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

[aviary-wf]

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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Questions or Comments? Reach out on Slack: #support-infosec.

[greglittlefield-wf]

These comments were outdated, so I cleaned them up

[greglittlefield-wf]

Basically, before we were testing that caching wasn't happening in DDC, which wasn't really the behavior we wanted ensure. I replaced it with a test that validates that it doesn't break, which is really the behavior we're after, at least for older SDKs.

[robbecker-wf]

Looks good. Thanks for the detailed comments on why things were done.

[robbecker-wf]

QA+1 CI Passes on 2.13 and 2.18
tests updated and pass with newer mockito

[greglittlefield-wf]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM