Don't break interactive components when their parent static content is updated

[SteveSandersonMS]

When streaming SSR, progressively-enhanced navigation, or progressively-enhanced form posts update part of the DOM dynamically, we have to make sure they behave sensibly when part of that DOM structure is an interactive component.

• Min bar: destroy the old interactive component and activate a new one
• Better: preserve the old interactive component, but ignore any new params supplied by the updated static content
• Best: ... also pass in new params from the updated static content

We likely only have capacity for a relatively basic implementation here, so may be limited to the min bar.