Fix label page search status filtering

[lipkau]

Summary

• filter Get-ConfluencePage -Label results to current pages only
• add unit coverage for trashed and archived label-search results
• add integration coverage in the existing Remove-ConfluencePage lifecycle to verify a deleted labeled page is no longer returned by label search
• tolerate transient server-info lookup failures during attachment downloads by falling back to API host detection
• update the changelog for Delete pages still show up in get-confluencepage with pagelabel #213

Fixes #213

Validation

• pwsh -NoLogo -NonInteractive -NoProfile -Command "Set-Location '/Users/LIO2MU/projects/AtlassianPS/agents/issue-213/ConfluencePS'; Invoke-Build -Task Lint; Invoke-Pester -Path 'Tests/Functions/Get-Page.Tests.ps1', 'Tests/Functions/Get-AttachmentFile.Tests.ps1'"
• pwsh -NoLogo -NonInteractive -NoProfile -Command "Set-Location '/Users/LIO2MU/projects/AtlassianPS/agents/issue-213/ConfluencePS'; Invoke-Build -Task Build, Test"
• Cloud integration is validated by GitHub Actions. Local Cloud integration is blocked because CONFLUENCE_CLOUD_URL, ATLASSIAN_CLOUD_USER, and ATLASSIAN_CLOUD_PAT are not configured in this worktree.