fix(base/db): pass database connection to get_machine_info

[AritraDey-Dev]

Description

Currently, any function using convert_input fails with the following error because get_machine_info is missing a database connection:

 2025-12-05 13:08:14.404217 DEBUG  [PEcAn.DB::convert_input] : 
   No existing record found. Should be good to go. 
2025-12-05 13:08:14.405256 SEVERE [db.query] : 
   No parameters or connection specified 
Error: Process completed with exit code 1.

This PR passes the existing database connection con to get_machine_info within convert_input.R to resolve this error.

Motivation and Context

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I agree that PEcAn Project may distribute my contribution under any or all of
  • the same license as the existing code,
  • and/or the BSD 3-clause license.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[infotroph]

Thank you for the patch!

Caution for future readers with superficially similar issues: This fixes a failure in cases where your run has an active DB connection. Making convert_input work right in the increasingly common case where the DB is not available (so con is NULL) will be a separate and larger task.