recreate lagoon-internal-registry-secret secret if it does not exist

[Schnitzel]

during debugging and trying to find a workaround for https://github.com/amazeeio/lagoon-kbd/issues/57 I found that if:

1. the secret lagoon-internal-registry-secret does not exist
2. the robot account in harbor is still valid (not deleted, not expired yet) then:
   • CreateOrRefreshRobot returns nil and the following code: https://github.com/amazeeio/lagoon-kbd/blob/12419865e6ffc971d73befcc2b251420303b781f/controllers/lagoonbuild_controller.go#L945-L962
   • does not upsert the secret the only way to create the secret again is to delete the robot account in harbor which is a bit confusing.

I think we should always upsert the image with the robot account, but I guess this might not be possible as we cannot get the token anymore from harbor after the robot account was created. So maybe we need to check if the lagoon-internal-registry-secret does not exist, that we forcefully recreate the robot account?

[shreddedbacon]

Yep, that sounds good