Update version, changelog, release notes for 1.3.0-preview1

[anamnavi]

PR Summary

Update version, changelog, release notes for 1.3.0-preview1

PR Context

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Documentation needed
    • Issue filed:
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and enumerated concerns in the summary.

[Copilot]

Pull request overview

Updates PSResourceGet metadata to prepare the 1.3.0-preview1 release by bumping the module version, setting the prerelease label, and adding corresponding release notes/changelog entries.

Changes:

• Bump module manifest version to 1.3.0 and set Prerelease = 'preview1'.
• Add 1.3.0-preview1 release notes to the module manifest.
• Add a 1.3.0-preview1 entry to CHANGELOG/preview.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
src/Microsoft.PowerShell.PSResourceGet.psd1	Updates module version/prerelease and adds 1.3.0-preview1 release notes.
CHANGELOG/preview.md	Adds 1.3.0-preview1 section to the preview changelog.

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