Clarify interactions between Accepted condition and AttachedRoutes

[youngnick]

In #2535, @arkodg made the good point that setting Accepted to true on an invalid Listener is not correct by our current definition, but when @robscott and I reviewed this, it definitely needs clarification.

Probably something along the lines of:

• Attached implies that a Route has a valid parentRef and so will be processed at all by the relevant implementation.
• Accepted has the current meanings about validity etc.

If a Route fails to Attach, that's because something went wrong with the handshake between the Route's parentRefs and the Listener, so the implementation will never update the status of that Route. This makes AttachedRoutes a way to keep track of how many Routes will be impacted by a Listener change, and relatively orthogonal to if those Routes are valid (Accepted) or not.

This issue covers updating the docs for AttachedRoutes and/or Accepted Conditions to make this more clear.

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/lifecycle stale

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/lifecycle rotten

[youngnick]

/remove-lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle rotten

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close not-planned

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