fix: Don't allow sending path status frames on non-multipath connections

[matheus23]

No description provided.

[dignifiedquire]

needs update/rebase

[flub]

-1 on all the renames to be fair. But it seems I'm alone on this 🤷

[flub]

Hum, should this error if multipath is not negotiated? I guess it's not wrong right now, but a little weird. Let's leave it for now maybe.

[matheus23]

Is this something that causes something to be sent over the wire? If so, then yes this should return an error if multipath is not negotiated.
If not, then I think that's optional.

[flub]

-1 on all the renames to be fair. But it seems I'm alone on this 🤷

Let me expand on this. I think the state of a path is not very clearly defined in the multipath draft, and therefore folks (including me) do not have a clear view of the states. Essentially at any point it is valid to send a packet for a path_id as long as the path_id is below the current max path ID and not yet abandoned. That means paths don't have a clearly defined "now it's open" state. A non-abandoned path below the current max path ID is always kinda open. And you can get path errors on paths you didn't know had been "active" yet.

[matheus23]

The main goal of this PR is to get the bug fix in. The renames just pollute the PR (I introduced them originally because I ended up creating a conflicting PathError, and needed two separate names).

Let's get this reviewed for the bug fix not for the renames.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.38%. Comparing base (a1cc539) to head (656f144).
⚠️ Report is 7 commits behind head on main-iroh.

Files with missing lines	Patch %	Lines
quinn-proto/src/connection/mod.rs	85.71%	1 Missing ⚠️
quinn/src/path.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           main-iroh     #191      +/-   ##
=============================================
- Coverage      76.38%   76.38%   -0.01%     
=============================================
  Files             83       83              
  Lines          22281    22286       +5     
=============================================
+ Hits           17020    17023       +3     
- Misses          5261     5263       +2     

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