[local-explorer-ui] Adds the Cron Trigger group to the Local Explorer

.changeset/cron-triggers-local-explorer-ui.md

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+---
+"@cloudflare/local-explorer-ui": minor
+---
+
+Add one-off Cron Trigger testing to Local Explorer
+
+Developers can invoke a Worker's configured or custom Cron Trigger with an exact or guided expression, choose a UTC or epoch-millisecond scheduled time, and inspect the latest structured result without editing configuration.

.changeset/cron-triggers-miniflare-assets.md

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+---
+"miniflare": minor
+---
+
+Package the Cron Triggers interface in Local Explorer
+
+The Local Explorer assets now include an interactive Cron Triggers destination for one-off local scheduled-handler testing.