fix: apply a dummy default controller config

[bavarianbidi]

to make garm work after the initialization, we apply a default config for webhookURL, metadataURL and callbackURL

this config will be overwritten once a garmserverconfig CR got applied

during the initial start of garm with the operator, the controller info will look like:

+-------------------------+-------------------------------------------------------------------------+
| FIELD                   | VALUE                                                                   |
+-------------------------+-------------------------------------------------------------------------+
| Controller ID           | dd2524b9-0789-499d-ba7d-3dba65cf9d3f                                    |
| Hostname                | garm-server-7c9d8f57b6-54zt2                                            |
| Metadata URL            | https://initial.metadata.garm.cloud                                     |
| Callback URL            | https://initial.callback.garm.cloud                                     |
| Webhook Base URL        | https://initial.webhook.garm.cloud                                      |
| Controller Webhook URL  | https://initial.webhook.garm.cloud/dd2524b9-0789-499d-ba7d-3dba65cf9d3f |
| Minimum Job Age Backoff | 30                                                                      |
| Version                 | v0.1.5                                                                  |
+-------------------------+-------------------------------------------------------------------------+

after a corresponding garmserverconfig CR gets applied, the controller info will look like:

garm-cli-v0.1.5 controller show
+-------------------------+---------------------------------------------------------------------------------------------+
| FIELD                   | VALUE                                                                                       |
+-------------------------+---------------------------------------------------------------------------------------------+
| Controller ID           | dd2524b9-0789-499d-ba7d-3dba65cf9d3f                                                        |
| Hostname                | garm-server-7c9d8f57b6-54zt2                                                                |
| Metadata URL            | http://garm-server.garm-server.svc:9997/api/v1/metadata                                     |
| Callback URL            | http://garm-server.garm-server.svc:9997/api/v1/callbacks                                    |
| Webhook Base URL        | http://garm-server.garm-server.svc:9997/api/v1/webhook                                      |
| Controller Webhook URL  | http://garm-server.garm-server.svc:9997/api/v1/webhook/dd2524b9-0789-499d-ba7d-3dba65cf9d3f |
| Minimum Job Age Backoff | 30                                                                                          |
| Version                 | v0.1.5                                                                                      |
+-------------------------+---------------------------------------------------------------------------------------------+