fix(chart): add service.enable_tls to values

[knkarthik]

When trying to instal this chart with ArgoCD I was getting the following error:

Error: template: qdrant/charts/qdrant/templates/tests/test-db-interaction.yaml:84:48: executing "qdrant/charts/qdrant/templates/tests/test-db-interaction.yaml" at <$root.Values.config.service.enable_tls>: nil pointer evaluating interface {}.enable_tls

The test-db-interaction test was failing because it was checking for config.service.enable_tls which did not exist in the values.yaml file.

This commit adds the service.enable_tls key to the config section of the values.yaml file and sets its default value to false. This allows the test to correctly determine whether to use http or https when connecting to the qdrant service.

[knkarthik]

@bashofmann Can you take a look at this when you get a chance. Thanks!