Fixed ImportDbaCsv for non default SqlBulkCopyOptions

[spaghettidba]

Type of Change

• Bug fix (non-breaking change, fixes #)
• New feature (non-breaking change, adds functionality)
• Breaking change (effects multiple commands or functionality)
• Ran manual Pester test and has passed (`.\tests\manual.pester.ps1)
• Adding code coverage to existing functionality
• Pester test is included
• If new file reference added for test, has is been added to github.com/sqlcollaborative/appveyor-lab ?
• Nunit test is included
• Documentation
• Build system

Purpose

Fixed Import-DbaCsv when using non default SqlBulkCopyOptions such as KeepNulls and TableLock.
See Issues #4999 and #4998

Approach

The options were passed as strings, but they should have been values from the enum SqlBulkCopyOptions

Commands to test

Import-Dbacsv -SqlInstance SQLCSRV04\SQL2017 -Database Storage -Schema staging -Table DSK_DS8K_I BM_LSARRAY -Path C:\temp\storage\test.txt -Delimiter ";" -KeepNulls -TableLock

[potatoqualitee]

thanks a ton for the fixes! will redo the PR 🙇‍♀️