### Bug Description If craft-providers fails to launch an instance [here](https://github.com/canonical/craft-providers/blob/df23ecc1d8bb75304844d99bb74e3a89da9e2483/craft_providers/lxd/lxc.py#L607), then it will create a scenario where the instance can never be launched again. This happens because the instance is launched with `--config user.craft_providers.status=STARTING` and fails. The next time craft-providers runs, it sees the instance is `STARTING`, wrongly assumes another process is starting the instance, and times out after 60 seconds. To resolve this, craft-providers should delete the instance if it fails to launch. https://github.com/canonical/craft-providers/issues/448 may also prevent this issue from occurring. ### To Reproduce ```python from pathlib import Path import logging from craft_providers import bases, lxd logging.basicConfig(level="DEBUG") logger = logging.getLogger() # define alias, provider, and base alias = bases.BuilddBaseAlias.JAMMY my_base = bases.BuilddBase(alias=alias) provider_a = lxd.LXDProvider(lxd_project="project1") provider_a.ensure_provider_is_available() provider_b = lxd.LXDProvider(lxd_project="project2") provider_b.ensure_provider_is_available() with provider_a.launched_environment( project_name="hello-world", project_path=Path().absolute(), base_configuration=my_base, build_base=alias.value, instance_name="test-instance", ) as instance: logger.info("launched instance") try: with provider_b.launched_environment( project_name="hello-world", project_path=Path().absolute(), base_configuration=my_base, build_base=alias.value, instance_name="test-instance", ) as instance: logger.info("launched instance") except: logger.info("Failure is expected because of name conflict.") # delete all instances in project1 to resolve name conflict lxd.project.purge(lxc=lxd.LXC(), project="project1") # the instance in project2 will never launch because its status is "STARTING" with provider_b.launched_environment( project_name="hello-world", project_path=Path().absolute(), base_configuration=my_base, build_base=alias.value, instance_name="test-instance", ) as instance: logger.info("launched instance") ``` ### part yaml _No response_ ### Relevant log output ```shell n/a ```