Deprecated APIs/options to be removed by 4.5

[kartben]

This issue tracks APIs/options which are meant to be removed by the 4.5.0 release
(after they have been deprecated for 2 releases or more)

4.5.0

• Legacy USB device stack (usb: make device-next default and move legacy sample code to legacy directory #87269) (@jfischer-no)
• Generator flash targets (cmake: deprecate the flash debug debugserver attach rtt targets #93985) (@fabiobaltieri)

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Deprecation guidelines

https://docs.zephyrproject.org/latest/develop/api/api_lifecycle.html#deprecated

Related

• Deprecated APIs/options to be removed by 4.3 #80539