Bring back bool => boolValue change on Mesh resource

[slonka]

Description

#12895 broke syncing of Mesh. We reverted only Mesh related change here #13057 and we need to figure out how to safely transition bool => boolValue (or keep the workaround with SupressZeroNullModifier we can't keep the modifier workaround because it doesn't work).

[slonka]

The reason this did not work is that we still send proto over the wire

kuma/pkg/core/resources/model/utils.go

Lines 62 to 66 in 9a170fd

	if msg, ok := spec.(proto.Message); ok {
	return util_proto.UnmarshalAnyTo(src, msg)
	} else {
	return json.Unmarshal(src.Value, spec)
	}

. Does it make sense to try and send resources currently marshaled as proto (e.g. mesh) as a JSON? It works for "resources" so maybe? 🤔 If not this then the only other option is to deprecate the current fields and replace them with new ones - which I don't think we should do.

[lukidzi]

Triage: @slonka please add more details

[slonka]

We chatted with Ilya and my idea is not going to work. However if we were able to get rid of omitempty on the field and revive #12767 it could work