Populate coalesced chart values to Adapter

This MR populates the default values of the Helm Chart and coalesces the existing values of the Custom Resource Adapter.

Currently, the adapter values are only populated from user provided values in the GitLab resource specification and default/override values of the Operator. It does not contain the default values of the chart. This causes issues such as #141 (closed).

To resolve this issues, the default values of the Chart are merged with the existing values of the adapter. This happens after rendering the template.

Closes #141 (closed)