xtask/pipeline: Fix publish task (#2711)

* xtask/pipeline: Fix publish task

which was previously stuck in an infinite loop after successfully
publishing a crate. The error originated in the code only checking for
error conditions but not breaking out of the inner infinite loop in case
of success.

* xtask: Improve publish failure UX

by offering the user more actions to choose from when an error occured.

* utils/assets: Add generated prost files to assets

to make sure they're available at build time and are picked up by all
components. It seems we hit some strange bug with the build script
where, when running `cargo publish --dry-run` the build script **is
not** run before regularly compiling zellij-utils. This shouldn't happen
according to the docs, but I cannot explain what's causing it. So we're
using this as a workaround for now to make a smooth release.

* xtask: Prevent accidental git commit deletion

when dry-running a publish.

* utils: Add comments to protobuf-related code

to explain why these changes were performed. The comments all include a
link to an issue comment explaining the situation in greater detail.

* xtask: Build protobuf definitions

when building any part of the project, similar to how we build the
plugins when required. This should ensure that all crates built through
`cargo xtask` (which is the officially supported build method) will
receive up-to-date protobuf definitions.

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