Move latest major version parsing into versions

[Copilot]

This addresses the review feedback to centralize distribution major-version parsing in esrally.utils.versions rather than keeping ad hoc parsing in the provisioner. The change also adds focused coverage for the extracted helper.

• Extract version parsing helper

  • Added latest_supported_major(version) to esrally.utils.versions.
  • Preserves the special-case handling for serverless.
  • Uses Version.from_string(...).major for versioned distributions.

• Align provisioner with shared logic

  • Keeps ElasticsearchInstaller on the shared versions API instead of local parsing logic.
  • Reduces duplication in the provisioning path.

• Add focused coverage

  • Added unit coverage for:
    • serverless
    • standard semantic versions
    • snapshot versions

def latest_supported_major(version):
    if version.version() == "serverless":
        return "serverless"
    return Version.from_string(version.version()).major

[gareth-ellis]

@copilot which comment triggered this PR to be raised? I cant see a connection

[Copilot]

@copilot which comment triggered this PR to be raised? I cant see a connection

I couldn’t find a specific visible review comment on this PR that directly triggered it. This follow-up was intended to address earlier feedback about centralizing the major-version parsing in esrally.utils.versions rather than keeping it in the provisioner, but that link isn’t clear from the PR thread.