[CASCL-1386] Harmonize impact-list bullet styles in cluster uninstall

[L3n41c]

What does this PR do?

Harmonizes the impact-list bullet style in the kubectl datadog autoscaling cluster uninstall command: first-level items use • (U+2022) and second-level items use ◦ (U+25E6), matching the style introduced for evict-legacy-nodes.

Motivation

Both commands print a two-level impact summary; this keeps their bullet styles consistent. Cosmetic only.

Additional Notes

Split out of #3026 as an independent change (targets main directly). No behavior change.

Minimum Agent Versions

N/A — kubectl-datadog plugin only.

Describe your test plan

go build ./cmd/kubectl-datadog/... passes; output-only change.

Checklist

• PR has at least one valid label
• qa/skip-qa label applied
• All commits are signed

[datadog-prod-us1-6]

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🛑 Gate Violations

🎯 1 Code Coverage issue detected

A Patch coverage percentage gate may be blocking this PR.

• Patch coverage: 0.00% (threshold: 80.00%)

ℹ️ Info

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 44.27% (+0.00%)

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.03%. Comparing base (92788bf) to head (b28e6e6).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...datadog/autoscaling/cluster/uninstall/uninstall.go	0.00%	19 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3172   +/-   ##
=======================================
  Coverage   44.03%   44.03%           
=======================================
  Files         377      377           
  Lines       30713    30713           
=======================================
  Hits        13525    13525           
  Misses      16300    16300           
  Partials      888      888           

Flag	Coverage Δ
unittests	44.03% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...datadog/autoscaling/cluster/uninstall/uninstall.go	0.00% <0.00%> (ø)

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