Require containers 0.2.1 for sleepAfter streams (#544)

* Require containers 0.2.1 for stream activity

Update sandbox to require the containers release that tracks in-flight
proxy work for sleepAfter. Add an E2E regression so long-running quiet
execStream calls do not get terminated while the container is still
active.

* Trim quiet stream assertion output

* Add idle sleepAfter regression test

* Avoid rearming idle sleepAfter in test

* Reduce idle sleepAfter test flakiness

* Disconnect idle WebSocket transport

* Bump containers to 0.2.2

Switch the sandbox dependency to the released containers package and
update the pending changeset text to match the minimum supported
version.

Author: whoiskatrin

.changeset/quiet-stream-sleepafter.md

@@ -0,0 +1,5 @@
+---
+'@cloudflare/sandbox': patch
+---
+
+Require `@cloudflare/containers` 0.2.2 or newer so long-running streamed commands stay alive past `sleepAfter` while work is still in progress.

package-lock.json

@@ -8,7 +8,7 @@
   "description": "A sandboxed environment for running commands",
   "type": "module",
   "dependencies": {
-    "@cloudflare/containers": "^0.2.0",
+    "@cloudflare/containers": "^0.2.2",
     "aws4fetch": "^1.0.20"
   },
   "devDependencies": {