Fix Intermittent Integration Test Failures

There are intermittent integration test failures occurring in OpticalDiskDriveLetter:

VERBOSE: Perform operation 'Invoke CimMethod' with following parameters, ''methodName' = 
SendConfigurationApply,'className' = MSFT_DSCLocalConfigurationManager,'namespaceName' = 
root/Microsoft/Windows/DesiredStateConfiguration'.
VERBOSE: An LCM method call arrived from computer WIN-B3R5QEEO4UF with user sid 
S-1-5-21-4047340035-1406749611-3780686611-500.
VERBOSE: [WIN-B3R5QEEO4UF]: LCM:  [ Start  Set      ]
VERBOSE: [WIN-B3R5QEEO4UF]: LCM:  [ Start  Resource ]  [[OpticalDiskDriveLetter]Integration_Test]
VERBOSE: [WIN-B3R5QEEO4UF]: LCM:  [ Start  Test     ]  [[OpticalDiskDriveLetter]Integration_Test]
VERBOSE: [WIN-B3R5QEEO4UF]:                            [[OpticalDiskDriveLetter]Integration_Test] 
Get-OpticalDiskDriveLetter: Using Get-CimInstance to get the drive letter of optical disk 2 in the system.
VERBOSE: [WIN-B3R5QEEO4UF]:                            [[OpticalDiskDriveLetter]Integration_Test] Perform operation 
'Enumerate CimInstances' with following parameters, ''namespaceName' = root\cimv2,'className' = Win32_CDROMDrive'.
VERBOSE: [WIN-B3R5QEEO4UF]:                            [[OpticalDiskDriveLetter]Integration_Test] Operation 'Enumerate 
CimInstances' complete.
VERBOSE: [WIN-B3R5QEEO4UF]:                            [[OpticalDiskDriveLetter]Integration_Test] 
Get-OpticalDiskDriveLetter: The optical disk 2 could not be found in the system.
VERBOSE: [WIN-B3R5QEEO4UF]: LCM:  [ End    Test     ]  [[OpticalDiskDriveLetter]Integration_Test]  in 0.1880 seconds.
      [-] Should compile and apply the MOF without throwing 389ms
        Expected no exception to be thrown, but an exception "PowerShell DSC resource DSC_OpticalDiskDriveLetter  failed to execute Test-TargetResource functionality with error message: The optical disk 2 could not be found in the system, so this resource has nothing to do. This resource does not change the drive letter of mounted ISOs.
        Parameter name: DiskId " was thrown from D:\a\1\s\tests\Integration\DSC_OpticalDiskDriveLetter.Integration.Tests.ps1:199 char:21
            +                     Start-DscConfiguration `
            +                     ~~~~~~~~~~~~~~~~~~~~~~~~.
        206:                 } | Should -Not -Throw
        at <ScriptBlock>, D:\a\1\s\tests\Integration\DSC_OpticalDiskDriveLetter.Integration.Tests.ps1: line 182
VERBOSE: An LCM method call arrived from computer WIN-B3R5QEEO4UF with user sid 
S-1-5-21-4047340035-1406749611-3780686611-500.

https://dev.azure.com/dsccommunity/StorageDsc/_build/results?buildId=2281&view=logs&j=e5903dc0-299b-5c16-f4a4-7b2df32e77c1&t=43d65258-a80c-540d-cc9c-6272089b2054&l=2142

The issue occurs more frequently on Windows Server 2019.

dsccommunity / StorageDsc

Fix Intermittent Integration Test Failures #240