changes bootstrapping networking to use clusterip and other modes via release values

[enekofb]

Closes #3495

What changed?

Implemented weaveworks/weave-gitops-private#139:

• Changes bootstrapping default networking access to just clusterip
• Added other configuration to the helm release values

Why was this change made?

First implementation didn't allow extensibility and took a few assumptions that were not necessarily generally applicable.

How was this change implemented?

• Apart the changes in the description earlier, introduced git and flux clients to be able to do unit testing with fakeclients.
• Cleaned also references to unused configuration options like domainXX

How did you validate the change?

• Explain how a reviewer can verify the change themselves

Run the acceptance test or run the command manually

• Integration tests -- what is covered, what cannot be covered;
  or, explain why there are no new tests

No new integration points added.

• Unit tests -- what is covered, what cannot be covered; are
  there tests that fail without the change?

• added for the install step

Release notes

Documentation Changes

weaveworks/weave-gitops#4153

Other follow ups

No

[waleedhammam]

LGTM / Tested the flow
It's also necessary to update the documentation in this release for this part