fix(cloudwatch): use Number.isFinite to also reject Infinity in block config

Aligns block-level validation with route's Zod .finite() refinement so
Infinity/-Infinity are caught at the block config layer, not just the API.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/blocks/blocks/cloudwatch.ts

@@ -571,8 +571,8 @@ Return ONLY the numeric timestamp - no explanations, no quotes, no extra text.`,
               throw new Error('Metric value is required')
             }
             const numericValue = Number(rest.metricValue)
-            if (Number.isNaN(numericValue)) {
-              throw new Error('Metric value must be a valid number')
+            if (!Number.isFinite(numericValue)) {
+              throw new Error('Metric value must be a finite number')
             }
 
             return {