build: Exclude the qcow2 block tests from the metrics runner

The metrics test list has grown significantly and no longer finishes
even within the 60-minute timeout. Exclude the block_qcow2 group (30
tests) in addition to the micro benchmarks, leaving a 30-test set that
completes meaningfully (~41 minutes in my testing). Trimming and
re-tuning the metrics test list is tracked in #8551.

Since the underlying bare-metal system is also retired, run the metrics
tests on the garm-jammy-16 (Azure VM) runner instead.

Signed-off-by: Bo Chen <bchen@crusoe.ai>

.lychee.toml

@@ -23,6 +23,9 @@ exclude = [
   '^tcp://192\.168\.1\.10',
   # Slack invite endpoints reject automated GETs and return 403.
   '^https://join\.slack\.com/t/',
+  # Metrics publish endpoint only answers authenticated PUTs; a plain GET
+  # returns 404.
+  '^https://ch-metrics\.azurewebsites\.net/api/publishmetrics',
 ]
 
 # Exclude loopback addresses