Cluster: Remove cluster node removal code and update messaging

[nickgw]

Pull Request (PR) description

This is just one option to resolve #257 .

Remove code that removes a cluster node that is in the Down state from the cluster.

This Pull Request (PR) fixes the following issues

• Fixes #257

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [x] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #271 (f1f303b) into main (9908405) will decrease coverage by 0%. The diff coverage is 0%.

@@         Coverage Diff         @@
##           main   #271   +/-   ##
===================================
- Coverage   100%    99%   -1%     
===================================
  Files         7      7           
  Lines       458    457    -1     
===================================
- Hits        458    454    -4     
- Misses        0      3    +3     

Impacted Files	Coverage Δ
source/DSCResources/DSC_Cluster/DSC_Cluster.psm1	97% <0%> (-3%)	:arrow_down:

[johlju]

Closing this as I think this will be resolved in PR #272 instead. @nickgw reopen if it was wrong of me to close this.