Report Veeam backup copy job sessions

VBR 12+ backup copy jobs showed as Unknown. Get-VBRJob returns the copy
(policy) job, but Get-VBRBackupSession only returns sessions of its
hidden worker jobs, whose JobId matches no listed job, so they were
dropped. Confirmed on a VBR 13.0.2 server with the new diagnostics
script.

- File worker sessions under their policy job via
  Session.GetJob().PolicyJobId (looked up once per worker job), and
  record the source job in details.copied_from
- Add Get-VeeamCollectorDiagnostics.ps1, a read-only report of jobs,
  unmatched sessions and their link properties
- Mock: backup copy policy/worker case and a session from a deleted job

Co-Authored-By: Claude Opus 5.5 <[email protected]>

collectors/veeam/tests/MockVeeam.ps1

@@ -44,9 +44,23 @@ $global:MockJobs = @(
     # Older VBR versions return NextRun as a culture-formatted string
     (New-MockJob 'SQL01 – Logs' 'Backup' $now.AddMinutes(40).ToString()),
     (New-MockJob 'Offsite Copy' 'BackupSync' $null),
-    (New-MockJob 'Old Exchange' 'Backup' $now.AddDays(1) $false)
+    (New-MockJob 'Old Exchange' 'Backup' $now.AddDays(1) $false),
+    # VBR 12+ backup copy job (immediate mode, no schedule): the "policy" job Get-VBRJob returns
+    (New-MockJob 'Cloud Copy' 'SimpleBackupCopyPolicy' $null)
 )
-$fs, $sql, $copy, $old = $global:MockJobs
+$fs, $sql, $copy, $old, $cloud = $global:MockJobs
+
+# Its hidden worker job, one per source job. Get-VBRJob doesn't return it, and Get-VBRBackupSession
+# returns only the worker's sessions. Shape taken from a real VBR 13 server.
+$cloudWorker = [pscustomobject]@{
+    Id = New-StableGuid 'Cloud Copy\File Server – Nightly'; Name = 'Cloud Copy\File Server – Nightly'
+    JobType = 'SimpleBackupCopyWorker'; PolicyJobId = $cloud.Id
+}
+function New-MockWorkerSession($Start, $End, $Result) {
+    $s = New-MockSession $cloudWorker $Start $End 'Stopped' $Result -Size 40GB
+    $s | Add-Member ScriptMethod GetJob { $cloudWorker }
+    $s
+}
 
 $global:MockSessions = @(
     (New-MockSession $fs $now.AddDays(-1).AddHours(-2) $now.AddDays(-1).AddHours(-1) 'Stopped' 'Success' -Size 128GB -Tasks @(
@@ -58,7 +72,11 @@ $global:MockSessions = @(
         -LogRecords @(
             [pscustomobject]@{ Title = 'Preparing backup chain'; Status = 'ESucceeded' },
             [pscustomobject]@{ Title = 'Network path not found (0x80070035)'; Status = 'EFailed' })),
-    (New-MockSession $old $now.AddDays(-10) $now.AddDays(-10).AddHours(1) 'Stopped' 'Success')  # outside 48h lookback
+    (New-MockSession $old $now.AddDays(-10) $now.AddDays(-10).AddHours(1) 'Stopped' 'Success'),  # outside 48h lookback
+    (New-MockWorkerSession $now.AddDays(-1).AddMinutes(-55) $now.AddDays(-1).AddMinutes(-30) 'Success'),
+    (New-MockWorkerSession $now.AddMinutes(-55) $now.AddMinutes(-35) 'Warning'),
+    # A session from a job the collector doesn't know (e.g. deleted): must be ignored, not crash
+    (New-MockSession ([pscustomobject]@{ Id = New-StableGuid 'gone'; Name = 'Deleted job' }) $now.AddHours(-2) $now.AddHours(-1) 'Stopped' 'Success')
 )
 
 function Get-VBRJob { [CmdletBinding()] param() $global:MockJobs }