Follow-up removal of deprecated recipes after appfw removal

Follow-up removal of deprecated recipes after appfw removal

A follow-up cleanup to the previous changes.
- the aws+azure binders are deprecated in master, thus remove meta-iot-cloud
- meta-security is no longer a dependency
- rm agl-sota (due to meta-updater deprecation)
- rm agl-sign-wgts feature
- cleanup poky-agl.conf

Bug-AGL: SPEC-4121
Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Change-Id: I274179ab1fb74b274e955bd9a3eeccccac615770
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26870
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Scott Murray <scott.murray@konsulko.com>