[AL] Ignore bclicense files

[christianbraeunlich]

Reasons for making this change:

As suggested in this tweet https://twitter.com/schnieringer/status/1518652737369649153 by Christian Schnieringer we should ignore the .bclicense files aswell so that they don't get committed by accident.

Links to documentation supporting these rule changes:

https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/cside/cside-upload-license-file: So we recommend that you use the .bclicense file if you've gotten one.