Helm: No need for the default function

[manusa]

Description

Currently, we're computing a Helm expression for provided parameters where a default function is added in case the value is provided.

In our case, this default function is redundant since the value will also be added to the generated values.yaml file.

The default function is problematic when dealing with non-string variables.

Since the function is redundant, it's better to just remove it from the generated helm expression.