Move to Java 17 (migrate source code from Java 8)

[milamberspace]

Description

Migrate the Java 8 source code to Java 17

• Pattern Matching for instanceof uses (Java 14/16)
• Implicit Typing with var (Java 10)
• Using Switch Expressions / yield Keyword (Java 14)
• Using Text Blocks (Java 15)

Motivation and Context

See #6219

How Has This Been Tested?

• All tests passed : OK
• Build the archives : OK (with Java 17 / 21 and 24, on Linux)
• Manual tests : OK

Screenshots (if appropriate):

Types of changes

• Breaking change : Now need Java17+ to run JMeter

Checklist:

• [X] My code follows the code style of this project.
• [ ] I have updated the documentation accordingly.