Remove code deprecated in 2.6.0

This is a handle turning exercise - no coding skill is needed, you just need to be thorough 😃

1. Find out what needs to be removed: grep -R deprec zap/src/main/java | grep "2.6.0" - there should be 41 matches
2. Remove the classes / methods / fields found above
3. Add a ZAP header to any paros code changed (see examples below)
4. Add the affected classes / methods / fields to zap/zap.gradle.kts (see below)
5. Run spotlessApply
6. Run ./gradlew japicmp - it should pass, if not check the report it generates
7. Update the corresponding help file (see below)

Example PRs:

2.2.0 + 2.3.0: code: https://github.com/zaproxy/zaproxy/pull/7067 help: https://github.com/zaproxy/zap-core-help/pull/414 2.4.x: code: https://github.com/zaproxy/zaproxy/pull/7068 help: https://github.com/zaproxy/zap-core-help/pull/415 2.5.0: code: https://github.com/zaproxy/zaproxy/pull/7102 help: https://github.com/zaproxy/zap-core-help/pull/420

[thc202]

That’s steps 4 and 6 of the issue description.

[jini0x]

Finally, thank you very much