Contract init: add flag removal message

[Ifropc]

What

We plan to remove some flags from contract init as part of breaking changes (see #1586). This PR does just that.
Removed argument are hidden from help:

And when trying to use them there's an error that explains what are the alternatives.

error: invalid value 'test' for '--with-example <WITH_EXAMPLE>': This argument has been removed and will be not be recognized by the future versions of CLI: Adding examples via cli is no longer supported. You can still clone examples from the repo https://github.com/stellar/soroban-examples

For more information, try '--help'.

Why

See above

Known limitations

N/A

[elizabethengelman]

This lgtm! 👍

One additional thing that we can do as part of this PR is to remove the gix dependency - I think it was only being used for this command.

[elizabethengelman]

Also, I changed it in #1660 (which will not be necessary after this PR), but I think we'll want to move the init integration test into the integration dir. I think as it is now, it is not running.

[leighmcculloch]

There are a lot of changes coming from re-generated lockfile, but I assume it should not be a problem (especially considering we are releasing 22.0 🤔 )

@Ifropc I pushed a change reverting the Cargo.lock file, and then applying the minimal changes. It reduced the changes to the lock file from 1871 lines, to 899 lines. You may have done an update of all crates accidentally.

[leighmcculloch]

This change appears to be missing the --name option that's mentioned in #1586. Is that coming in a separate PR?

[Ifropc]

@leighmcculloch yes, the other changes are coming in a separate PR, Nando requested to split them for easier review
#1625

[Ifropc]

It reduced the changes to the lock file from 1871 lines, to 899 lines. You may have done an update of all crates accidentally.

Thank you! This is strange, because I got lockfile from main and then just ran cargo build (nothing else 🤔 )