Add support for Ubuntu 26.04

[trevorrea]

Summary

• Set default OpenJDK to 21 for Ubuntu 26.04 in params.pp
• Add Ubuntu 26.04 to supported OS releases in metadata.json
• Extend parameterized tests for Ubuntu 18.04 to include 20.04 and 22.04 (openjdk-11)
• Add separate tests for Ubuntu 24.04 (openjdk-17) and 26.04 (openjdk-21)

Additional Context

N/A

Related Issues (if any)

#617
#622

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified. (For example puppet apply)

[CLAassistant]

All committers have signed the CLA.

[trevorrea]

@span786 - can this be reviewed please?

[span786]

@trevorrea

We have merged the Debian 13 changes from PR #613.

Please consider removing the Debian 13 updates from this PR.
As for the Ubuntu 26.04 changes, they will need to wait until a Ubuntu 26.04 VM is provisioned for acceptance testing.

[trevorrea]

@span786 - removed Debian 13 changes as requested. What do you mean by "As for the Ubuntu 26.04 changes, they will need to wait until a Ubuntu 26.04 VM is provisioned for acceptance testing."

What's the issue here? This PR has been open for weeks with no progress. Can you do whatever required to get it merged please?

[jst-cyr]

Hey @trevorrea, I'll let @span786 give the more technical details, but at the moment the current releases of Puppet Enterprise and Puppet Core don't support Ubuntu 26, which means that the testing infrastructure for testing against Ubuntu 26 is still in progress while the team works through adding support for that version. That is what is meant by the acceptance testing VM provisioning comment.

Once we have that testing infrastructure available, we should be able to move this forward.