Incompatible base detection is too strict for non-Ubuntu bases

[lengau]

Bug Description

_validate_build_plan requires the base to be exactly the same, not just the same major version. While this is fine for Ubuntu, for bases like Debian and Almalinux this results in errors like:

2024-08-23 22:30:02.737 Almalinux 9 builds cannot be performed on this Almalinux 9.4 system.

To Reproduce

See: https://github.com/canonical/charmcraft/actions/runs/10532931826/job/29188508635?pr=1824

part yaml

n/a

Relevant log output

2024-08-23 22:30:02.732 Initialising lifecycle manager in /root
2024-08-23 22:30:02.733 Project vars: {'version': 'unversioned'}
2024-08-23 22:30:02.733 Adopting part: None
2024-08-23 22:30:02.734 Using parallel build count of 1 from CPU count
2024-08-23 22:30:02.735 Called not implemented method 'YUMRepository.configure' with name 'charmcraft'
2024-08-23 22:30:02.737 Almalinux 9 builds cannot be performed on this Almalinux 9.4 system.
2024-08-23 22:30:02.737 Detailed information: Builds must be performed on a specific system to ensure that the final artefact's binaries are compatible with the intended execution environment.
2024-08-23 22:30:02.738 Recommended resolution: Run a managed build, or run on a compatible host.
2024-08-23 22:30:02.995 Emitter: Resuming control of the terminal

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3374.

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