Connect-DbaInstance - Connect DAC to test connection as soon as possible

[andreasjordan]

Type of Change

• Hopefully helps fixing [Copy-DbaCredential] Failed to decrypt credentials #9253 together with other changes

Purpose

All other commands rely on Connect-DbaInstance returning an open connection. So this has to be true for DAC as well. So we have to open the DAC inside of Connect-DbaInstance.

Commands to test

# This should fail on the second line:
$dac1 = Connect-DbaInstance -SqlInstance SQL01 -DedicatedAdminConnection
$dac2 = Connect-DbaInstance -SqlInstance SQL01 -DedicatedAdminConnection

See #9253 for more details.

[potatoqualitee]

hoepful 🤞🏼