Stabilize layout components (#10381)

### WHY are these changes introduced?

Fixes #9978

polaris.shopify.com/content/components/layout-and-structure/bleed.md

@@ -3,7 +3,6 @@ title: Bleed
 category: Layout and structure
 keywords:
   - layout
-status: Alpha
 examples:
   - fileName: bleed-horizontal.tsx
     title: Horizontal
@@ -28,13 +27,6 @@ Applies negative margin to allow content to bleed out into the surrounding layou
 
 </Lede>
 
-<StatusBanner status={frontmatter.status}>
-  This component is a work in progress and ready for exploratory usage, with
-  breaking changes expected in minor version updates. Please use with caution.
-  Learn more about our [component
-  lifecycles](/getting-started/components-lifecycle).
-</StatusBanner>
-
 <Examples />
 
 <Props componentName={frontmatter.title} />

polaris.shopify.com/content/components/layout-and-structure/block-stack.md

@@ -10,7 +10,6 @@ keywords:
   - equal width
   - right-aligned stack
   - stack layout
-status: Alpha
 examples:
   - fileName: block-stack-with-gap.tsx
     title: Gap
@@ -35,13 +34,6 @@ Use to display children vertically and horizontally with full width by default.
 
 </Lede>
 
-<StatusBanner status={frontmatter.status}>
-  This component is a work in progress and ready for exploratory usage, with
-  breaking changes expected in minor version updates. Please use with caution.
-  Learn more about our [component
-  lifecycles](/getting-started/components-lifecycle).
-</StatusBanner>
-
 <Examples />
 
 <Props componentName={frontmatter.title} />

polaris.shopify.com/content/components/layout-and-structure/box.md

@@ -6,7 +6,6 @@ keywords:
   - box
   - responsive
   - tokens
-status: Alpha
 examples:
   - fileName: box-with-color.tsx
     title: Color
@@ -39,13 +38,6 @@ Box is the most primitive layout component. It’s a way to access Polaris desig
 
 </Lede>
 
-<StatusBanner status={frontmatter.status}>
-  This component is a work in progress and ready for exploratory usage, with
-  breaking changes expected in minor version updates. Please use with caution.
-  Learn more about our [component
-  lifecycles](/getting-started/components-lifecycle).
-</StatusBanner>
-
 <Examples />
 
 <Props componentName={frontmatter.title} />

polaris.shopify.com/content/components/layout-and-structure/card.md

@@ -21,7 +21,6 @@ keywords:
   - subdued card for secondary content
   - callout
   - call out
-status: Alpha
 examples:
   - fileName: card-default.tsx
     title: Default
@@ -50,13 +49,6 @@ Cards are used to group similar concepts and tasks together for merchants to sca
 
 </Lede>
 
-<StatusBanner status={frontmatter.status}>
-  This component is a work in progress and ready for exploratory usage, with
-  breaking changes expected in minor version updates. Please use with caution.
-  Learn more about our [component
-  lifecycles](/getting-started/components-lifecycle).
-</StatusBanner>
-
 <Examples />
 
 <Props componentName={frontmatter.title} />