Git source should check out a commit before recursing submodules

[mr-cal]

What needs to get done

Craft-parts currently clones a project, recursively fetches submodules, then checks out a specific commit.

Option 1

Init a repo, add the remote, fetch by the commit hash, then recurse submodules.

I'm not sure if this will work because some projects depend on a full history to set the version with git describe.

Option 2:

Clone the remote, fetch by the commit, the recurse submodules.

Why it needs to get done

Fetching submodules before switching to the commit is incorrect and can fail.

@dariuszd21 can advise on this task as he has been working with these types of fetching scenarios.

source: @tomponline via https://github.com/canonical/lxd-pkg-snap/pull/594/files#r1831605307

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3661.

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