internal/stack: improve semverLessThan error handling

[efd6]

This makes errors like this actionable.

Error: booting up the stack failed: creating stack files failed: there were 4 errors: template: docker-compose-stack.yml.tmpl:8:7: executing "docker-compose-stack.yml.tmpl" at <semverLessThan $version "8.0.0">: error calling semverLessThan: Invalid Semantic Version, template: elasticsearch.yml.tmpl:22:6: executing "elasticsearch.yml.tmpl" at <semverLessThan $version "8.0.0">: error calling semverLessThan: Invalid Semantic Version, template: kibana.yml.tmpl:5:52: executing "kibana.yml.tmpl" at <semverLessThan $version "8.15.0-SNAPSHOT">: error calling semverLessThan: Invalid Semantic Version, template: elastic-agent.env.tmpl:8:11: executing "elastic-agent.env.tmpl" at <semverLessThan $version "8.0.0">: error calling semverLessThan: Invalid Semantic Version

ref elastic/integrations#11052

[elasticmachine]

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[jsoriano]

LGTM, I only wonder if we should be a bit more verbose here.

[efd6]

@jsoriano Would you mind merging this? I cannot.

[mrodm]

@efd6 That error should also be fixed in integrations via this PR elastic/integrations#11126
Could you try again to run the tests there? Now the version should be retrieved correctly.

[efd6]

@mrodm Thanks. Trying now.