fix(flow-item): fix TS error caused by FlowItemLike type

[jcfranco]

Related Issue: #10801

Summary

Restores internal prop that was unintentionally made private by #10482.

[driskull]

👍

[maxpatiiuk]

Looks good

though need to double check if your docs rendering excludes @internal properties.

In docs.json it will appear like this:

          "docsTags": [
            {
              "name": "internal"
            }
          ],

[jcfranco]

though need to double check if your docs rendering excludes @internal properties.

I believe the doc site ignores @private and @ignore, but not @internal. @macandcheese I'll submit a PR for this.