Warn when multiple core22 snaps will be built in destructive mode

[mr-cal]

What needs to get done

If snapcraft is running in destructive mode, is building for core22, and the build plan contains multiple items, then a warning should be issued.

Why it needs to get done

core22 snaps can build multiple snaps in --destructive-mode. This may cause many subtle issues, like when cross-compiling or staging packages for different architectures.

This behavior was never intended and should be discouraged.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-2627.

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