Update docs tests to use dart analyze

[evanweible-wf]

A newer version of the Dart SDK has removed dartanalyzer, so we need to update our docs tests to use dart analyze.

[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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[autobot-wk]

Skynet test results failed initially for this build but were approved by evan.weible
https://wf-skynet-hrd.appspot.com/apps/test/smithy/3781042/1
Approval message: CI failures on beta/dev are known due to removal of dartanalyzer

[evanweible-wf]

QA +1

• This fixes the documentation tests. Remaining test failures are also due to removal of dartanalyzer, but are failing because the default behavior of ddev analyze is to use dartanalyzer and we can't easily change that without raising our minimum SDK, so we'll do that later.

[evanweible-wf]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM