Update Mock Exam 2 solutions to reflect latest question set

[MinWooPark-dotcom]

Description
The existing solution file for Mock Exam 2 (05-CKA-MockExam-2-Solution.md) is outdated due to changes in the actual mock exam questions. While the file structure remains valid, several answers are no longer accurate or aligned with the updated questions.

This update will focus solely on revising the answers based on the latest mock exam content. No changes will be made to the file structure, naming conventions, or repository layout.

Proposal

• Review and update all 12 questions in 04-CKA-MockExam-2-Solution.md (currently named as such) to reflect the current version of the mock exam
• Maintain the formatting and structure introduced in 03-CKA-MockExam-1-Solution.md (see PR docs: Restructure mock exam files and update solutions for mock exam 1 #196)
• Ensure technical correctness, syntax accuracy, and clarity of explanations
• No update to README.md is required as the file location remains unchanged
  Note: The solution file will be renamed to 05-CKA-MockExam-2-Solution.md after restructuring, following the naming convention established in Mock Exam 1.

Motivation

• Align the solution file with the current mock exam question set
• Help learners avoid confusion caused by outdated answers
• Ensure consistency in quality and accuracy across all mock exam solutions

Related PR: #200