Remove topics frontmatter property from schema and codebase (#60294)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: heiskr

content/rest/copilot/copilot-coding-agent-management.md

@@ -5,8 +5,6 @@ intro: Use the REST API to manage settings for {% data variables.copilot.copilot
 versions: # DO NOT MANUALLY EDIT. CHANGES WILL BE OVERWRITTEN BY A 🤖
   fpt: '*'
   ghec: '*'
-topics:
-  - API
 autogenerated: rest
 allowTitleToDifferFromFilename: true
 ---

src/app/lib/main-context-adapter.ts

@@ -70,7 +70,6 @@ export function createMinimalMainContext(
     title?: string
     fullTitle?: string
     introPlainText?: string
-    topics?: string[]
     documentType?: string
     hidden?: boolean
   },
@@ -94,7 +93,6 @@ export function createMinimalMainContext(
     page: pageData
       ? {
           documentType: pageData.documentType || 'article',
-          topics: pageData.topics || [],
           title: pageData.title || 'Page Not Found',
           fullTitle: pageData.fullTitle || pageData.title,
           introPlainText: pageData.introPlainText,

src/content-linter/tests/fixtures/journey-tracks/duplicate-ids.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 journeyTracks:
   - id: duplicate-id
     title: "First Track"

src/content-linter/tests/fixtures/journey-tracks/invalid-paths.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 journeyTracks:
   - id: track-1
     title: "Track with Invalid Guides"

src/content-linter/tests/fixtures/journey-tracks/no-journey-tracks.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 ---
 
 # Journey without Journey Tracks

src/content-linter/tests/fixtures/journey-tracks/non-journey-layout.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 journeyTracks:
   - id: track-1
     title: "Should be ignored"

src/content-linter/tests/fixtures/journey-tracks/valid-journey.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 journeyTracks:
   - id: track-1
     title: "Getting Started Track"

src/content-linter/tests/fixtures/landing-carousels/article-one.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 ---
 
 # Article One

src/content-linter/tests/fixtures/landing-carousels/article-two.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 ---
 
 # Article Two

src/content-linter/tests/fixtures/landing-carousels/duplicate-carousels.md

@@ -5,8 +5,6 @@ versions:
   fpt: '*'
   ghec: '*'
   ghes: '*'
-topics:
-  - Testing
 carousels:
   recommended:
     - /article-one