feat(block): improve block's content layout to allow scrolling (#7367)

**Related Issue:** #5686 

## Summary

This applies @nwhittaker's
[suggestion](#5686 (comment))
(belated thanks! 🎉) to make scrolling setup easier within blocks.

Author: jcfranco

packages/calcite-components/src/components/block/block.scss

@@ -139,7 +139,7 @@ calcite-handle {
 }
 
 .content {
-  @apply animate-in flex-1 relative;
+  @apply animate-in flex-1 relative min-h-0;
   padding-block: var(--calcite-block-padding, theme("spacing.2"));
   padding-inline: var(--calcite-block-padding, theme("spacing[2.5]"));
 }

packages/calcite-components/src/components/block/block.stories.ts

@@ -243,3 +243,38 @@ export const loadingWithStatusIcon_TestOnly = (): string =>
 
     <calcite-block heading="Invalid status" description="summary" status="invalid"> </calcite-block>
   `;
+
+export const scrollingContainerSetup_TestOnly = (): string => html`<style>
+    calcite-block {
+      height: 250px;
+      overflow: hidden;
+    }
+
+    .scroll-container {
+      height: 100%;
+      overflow-y: scroll;
+    }
+
+    p {
+      background: linear-gradient(to bottom, red, transparent);
+      height: 500px;
+      margin: 0;
+    }
+  </style>
+  <calcite-block heading="Should scroll to the gradient at the bottom" open>
+    <div class="scroll-container">
+      <p></p>
+    </div>
+  </calcite-block>
+  <script>
+    (async () => {
+      const block = document.querySelector("calcite-block");
+      await customElements.whenDefined("calcite-block");
+      await block.componentOnReady();
+
+      const scrollContainer = document.querySelector(".scroll-container");
+      scrollContainer.scrollTo(0, 500);
+    })();
+  </script>`;
+
+scrollingContainerSetup_TestOnly.parameters = { chromatic: { delay: 500 } };