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/09-information-security/information-security-projects/anonymous-message-board.english.md

@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c45
 title: Anonymous Message Board
 challengeType: 4
-isHidden: false
 isRequired: true
 forumTopicId: 301568
 ---

curriculum/challenges/english/09-information-security/information-security-projects/port-scanner.english.md

@@ -2,7 +2,6 @@
 id: 5e46f979ac417301a38fb932
 title: Port Scanner
 challengeType: 10
-isHidden: false
 isRequired: true
 ---
 

curriculum/challenges/english/09-information-security/information-security-projects/secure-real-time-multiplayer-game.english.md

@@ -2,7 +2,6 @@
 id: 5e601c775ac9d0ecd8b94aff
 title: Secure Real Time Multiplayer Game
 challengeType: 4
-isHidden: false
 isRequired: true
 ---
 

curriculum/challenges/english/09-information-security/information-security-projects/sha-1-password-cracker.english.md

@@ -2,7 +2,6 @@
 id: 5e46f983ac417301a38fb933
 title: SHA-1 Password Cracker
 challengeType: 10
-isHidden: false
 isRequired: true
 ---
 

curriculum/challenges/english/09-information-security/information-security-projects/stock-price-checker.english.md

@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c44
 title: Stock Price Checker
 challengeType: 4
-isHidden: false
 isRequired: true
 forumTopicId: 301572
 ---