fall back to getting values with unresolved templates in EasyBlock.check_checksums_for

[boegel]

Fix for problems that arise with for example QuantumESPRESSO-7.3-intel-2023a.eb in the easyconfigs test suite:

Failed to resolve all templates in "mkdir -p %(builddir)s/qe-%(version)s && tar xzvf %%s --strip-components=1 -C $_" using template dictionary: {...}

That's because the %(builddir)s template can not be resolved yet when checking checksums for sources/patches, but since that's part of extract_cmd there's no reason for concern here:

sources = [
    {
        'filename': 'q-e-qe-%(version)s.tar.gz',
        'extract_cmd': 'mkdir -p %(builddir)s/qe-%(version)s && tar xzvf %s --strip-components=1 -C $_',
        'source_urls': ['https://gitlab.com/QEF/q-e/-/archive/qe-%(version)s']
    },
...

Falling back to grabbing values without resolving templates via get_ref fixes this issue, only small downside is that it leads to using q-e-qe-%(version)s.tar.gz in any potential error messages in case of incorrect checksum.

edit: fallout from changes in #4516

[lexming]

Just one question

[lexming]

LGTM