Make it possible to optionally override .ReleaseIsInstall logic in init jobs

[doug-ba]

Is your feature request related to a problem? Please describe.
In solutions like ArgoCD which don't actually track helm state, .ReleaseIsInstall always evaluates to true. We should be able to optionally not use .ReleaseIsInstall to determine whether init jobs should be created/removed
Describe the solution you'd like
An optional parameter to disable using .ReleaseIsInstall to determine if init jobs should be created.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
I will be opening a PR with the necessary changes.