FED-1727 Remove the rest of the deprecated APIs for v7

[greglittlefield-wf]

Dependent PR

This PR is dependent on https://github.com/Workiva/react-dart/pull/373. I've made this PR into the null safety branch so that this is a clean diff, and we'll want to merge that PR first before this one.

Motivation

There are some APIs we've planned on removing in 7.0.0, and it's time to remove them.

Some APIs have already been removed in the v7_wip branch, and this PR should remove the rest of them.

Notably, there were quite a few APIs that aren't being removed outright, but instead are being made private.

Solution

• lib/react_client/react_interop.dart
  • Remove unused, deprecated APIs
    • JsPropValidator
    • ReactElementStore
    • React.createFactory
  • Make deprecated APIs private (mostly moved to a new lib/src/react_client/internal_react_interop.dart):
    • InteropContextValue
    • ReactDartContextInternal
    • markChildValidated
    • markChildrenValidated
    • createReactDartComponentClass
    • createReactDartComponentClass2
    • ReactDartInteropStatics
    • ComponentStatics
    • ComponentStatics2
    • JsComponentConfig
    • JsComponentConfig2
• Remove deprecated APIs in other libraries
  • SyntheticEvent members persist and isPersistent
  • memo

Testing

• Only deprecated APIs were removed
• CI passes
• Semver audit diff looks good: https://gist.github.com/greglittlefield-wf/7a41f38a3759441cfbef4e1b93a051b9

We'll do another semver audit of API changes from other PRs when we go to merge v7_wip, so no additional testing is needed at this time.

[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

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

[aaronlademann-wf]

+10

• [x] Changes here, and the changelog itself match up with the semver report
• [x] CI Passing

[greglittlefield-wf]

@Workiva/release-management-p