Release note and related updates for the 2.5.1 release

[kerry-meyer]

SUMMARY

This pull request updates the changelog.yml and CHANGELOG.rst files to provide a release note update for release 2.5.1 of the Dell enterprise_sonic Ansible resource module collection.

It also updates the release version in the galaxy.yml file accordingly.

GitHub Issues

List the GitHub issues impacted by this PR. If no Github issues are affected, please indicate this with "N/A".

GitHub Issue #
N/A

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

CHANGELOG.rst (release notes)

OUTPUT

N/A

ADDITIONAL INFORMATION

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

How Has This Been Tested?

Documentation changes only; no testing required.

[jeff-yin]

LGTM!