Hide/Remove deprecated methods

[kontura]

There is still public libdnf5::repo::Repo::load() which is marked as deprecated but it
cannot be easily hidden because dnfdaemon uses it as well.

@j-mracek since you originally marked it as deprecated do we want to keep the load() method or do we need to do some bigger changes to hide it?

For: #1091

[jan-kolarik]

LGTM.

Regarding the Repo::load() issue, we can address it in a follow-up PR if it's too complex. Currently, it's used in the Context, main and dnf5daemon. Since update_and_load_enabled_repos is expected to be the only method for loading repositories, the only way to load just the system repository seems to be manually disabling available repositories before executing that method, is that right? I'm not sure how common is this use case, but it does feel somewhat clumsy.

[kontura]

Regarding the Repo::load() issue, we can address it in a follow-up PR if it's too complex.

A follow-up PR sounds good.

Currently, it's used in the Context, main and dnf5daemon. Since update_and_load_enabled_repos is expected to be the only method for loading repositories, the only way to load just the system repository seems to be manually disabling available repositories before executing that method, is that right?

Yes, without the libdnf5::repo::Repo::load() I think that is the case.

I'm not sure how common is this use case, but it does feel somewhat clumsy.

Both dnf5 and dnf5daemon do it, I think its pretty common. For example for querying just installed packages.