Signed-off-by: Renan Rodrigo <[email protected]>

Signed-off-by: Renan Rodrigo <[email protected]>

We used to build the base file/folder structure when updating the local
APT cache. However, in some cases, the cache may be accessed before it
is created. In the past an exception was raised and we catched + ignored
it, but from Noble onward this turned to a simple warning on the APT
side.

We fix it by always ensuring the structure is present when trying to
fetch the cache.

Fixes: #3132

Signed-off-by: Renan Rodrigo <[email protected]>

Mantic is now EOL, so we are removing the mantic tests from the
acceptance suite.
- If the test was a general one, we add noble/oracular.
- If it was a test which targets interim releases, we add oracular.
- Some oracular tests are commented out until the backend+cloud is
  sorted out.

Signed-off-by: Renan Rodrigo <[email protected]>