Drop manual ADE test

The manual ADE test was meant to test the build and remote debugging of an
application with ADE, while other automated tests perform building checks.
After the switching to Flatpak, the use of ADE is only meant to handling
sysroots and not to debug applications, making this test useless.

Drop the manual test since it has not real value.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

test-cases/sdk-ade-remote-debugging.yaml

-metadata:
-  name: sdk-ade-remote-debugging
-  format: "Apertis Test Definition 1.0"
-  image-types:
-    basesdk: [ amd64 ]
-    sdk:     [ amd64 ]
-  image-deployment:
-    - APT
-  type: functional
-  exec-type: manual
-  priority: high
-  maintainer: "Apertis Project"
-  description: "Test remote debugging with ADE. Cross-build an example HelloWorld
-                agent, deploy it to the target device and debug it with proper
-                backtraces."
-
-  pre-conditions:
-    - "A SDK host."
-    - "An ARM i.MX6 target device reachable via SSH from the SDK host."
-    - "Access to the Apertis source code hosting service at:"
-    - "~https://gitlab.apertis.org/"
-    - "Username and password for the target device."
-    - "Check the IP address of the target device, you'll need it during
-       configuration."
-    - "gdbserver must be installed in the remote device. The debugging port (1234
-       by default) must be open."
-    - "apertis-dev-tools package is installed on the SDK."
-
-  expected:
-    - "The sample \"Hello World\" agent is successfully bundled and pushed to the
-       target device and the application bundle org.apertis.HelloWorldSimpleAgent
-       is available under /Applications on the target device."
-    - "The debug connection to gdbserver running on the target device is set up
-       succesfully, the execution of the debugged program can be controlled with
-       GDB commands and the backtrace GDB command is able to resolve debug symbols
-       and print meaningful stacktraces."
-
-run:
-  steps:
-    - "Install an ARM 32bit sysroot on the host"
-    - $ ade sysroot install
-    - "Enable key-based SSH login on the target device"
-    - $ ssh-keygen -t rsa -m PEM
-    - $ ssh-copy-id user@$HOST
-    - "Clone the source code for the HelloWorld sample agent on the SDK host"
-    - $ git clone https://gitlab.apertis.org/sample-applications/helloworld-simple-agent
-    - $ cd helloworld-simple-agent
-    - "Configure target device for debugging"
-    - $ ade configure --debug --device user@$HOST
-    - $ ade export
-    - $ ade install --device user@$HOST
-    - "Finally set up a debug connection to the target device"
-    - $ ade debug --device user@$HOST