Feat: hide blocks not challenges (#39504)

* fix: remove isHidden flag from frontmatter

* fix: add isUpcomingChange

Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>

* feat: hide blocks not challenges

Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>

Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/american-british-translator.english.md

@@ -2,7 +2,6 @@
 id: 5e601c0d5ac9d0ecd8b94afe
 title: American British Translator
 challengeType: 4
-isHidden: false
 isRequired: true
 ---
 

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/issue-tracker.english.md

@@ -2,7 +2,6 @@
 id: 587d8249367417b2b2512c42
 title: Issue Tracker
 challengeType: 4
-isHidden: false
 isRequired: true
 forumTopicId: 301569
 ---

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/metric-imperial-converter.english.md

@@ -2,7 +2,6 @@
 id: 587d8249367417b2b2512c41
 title: Metric-Imperial Converter
 challengeType: 4
-isHidden: false
 isRequired: true
 forumTopicId: 301570
 ---

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/personal-library.english.md

@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c43
 title: Personal Library
 challengeType: 4
-isHidden: false
 isRequired: true
 forumTopicId: 301571
 ---

curriculum/challenges/english/06-quality-assurance/quality-assurance-projects/sudoku-solver.english.md

@@ -2,7 +2,6 @@
 id: 5e601bf95ac9d0ecd8b94afd
 title: Sudoku Solver
 challengeType: 4
-isHidden: false
 isRequired: true
 ---