Not archive projects when scheduling for deletion

What does this MR do and why?

Decouples the archived state from project deletion scheduling. Projects will no longer be automatically archived when marked for deletion or unarchived when restored.

Implementation notes:

• Removed archived parameter from Projects::MarkForDeletionService
• Removed archived parameter from Projects::RestoreService
• Updated specs to verify archived state preservation

To-do:

• Add test context for initially archived projects:

context 'when project is initially archived' do
  before do
    project.update!(archived: true)
  end

  it 'keeps project archived when marked for deletion' do
    expect(result).to be_success
    expect(project.reload.archived).to be(true)
    expect(project.reload).to be_self_deletion_scheduled
  end
end

Closes #583420

cc @smaglangit