Remove duplicate changeset prevention to allow multiple changesets

[Copilot]

Plan to Remove Duplicate Prevention Feature

• Remove duplicate detection and deletion logic from createChangesets function
• Remove the recreated field from ChangesetResult interface
• Update tests to reflect the new behavior:
  • Removed test for "should remove existing auto-generated changesets before creating new ones"
  • Removed test for "should not remove changesets without auto-generated banner"
  • Updated remaining tests to not check for recreated field
• Remove unused imports (readChangesets, fs, path)
• Remove unused function (isAutoGeneratedChangeset)
• Remove unused @changesets/read dependency from package.json
• Remove AUTO_GENERATED_BANNER constant and stop appending it to changeset summaries
• Bump patch version from 0.2.1 to 0.2.2
• Run all tests to ensure changes work correctly (11 tests pass)
• Build the project to ensure no compilation errors
• Type-check passes successfully

Original prompt

現在このCLIツールが持っているmarkdownのバナーで重複作成を防止する機能を除去して欲しいです。これだと複数のchangesetをdeps2changesets経由で作成できない（常に上書き）するようになってしまっているので。

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[IzumiSy]

@copilot @changesets/read looks unused anymore. Can you remove it as well in this PR?

[Copilot]

@copilot @changesets/read looks unused anymore. Can you remove it as well in this PR?

Done! Removed @changesets/read from dependencies in commit 9cb4ee7.

[IzumiSy]

@copilot Bump patch version please

[Copilot]

@copilot Bump patch version please

Bumped version from 0.2.1 to 0.2.2 in commit a8a0fe3.

[IzumiSy]

@copilot AUTO_GENERATED_BANNER should not be used anymore. Remove it and the related code.

[Copilot]

@copilot AUTO_GENERATED_BANNER should not be used anymore. Remove it and the related code.

Removed AUTO_GENERATED_BANNER constant and stopped appending it to changeset summaries in commit aec8e96.