Set the project environment in the Lifecycle Service

### What needs to get done

Set the project's environment in the Lifecycle Service. There are two potential solutions described [here](https://github.com/canonical/craft-application/pull/318#discussion_r1576953260).

### Why it needs to get done

`CRAFT_PROJECT_NAME` and `CRAFT_PROJECT_VERSION` are not available as environment variables in the build environment.

See #318 for context

Start with the Lifecycle Service and read the two proposed solutions in PR #318's discussion, then review issue #318 for context. Verify which approach makes CRAFT_PROJECT_NAME and CRAFT_PROJECT_VERSION available in the build environment when the project's environment is set.

Written by the indexing model from the issue text.