chore: filter out milestone strategies in features_view

[nunogois]

https://linear.app/unleash/issue/2-3033/filter-out-release-plan-milestone-strategies-from-admin-feature

Filters out milestone strategies from our features_view.

This felt like the most elegant way to address this, since it seems we only rely on this view to fetch the feature strategies in the admin UI.

No more milestone strategies showing up on our UI when we have a running milestone

However they're still part of the client features response

{
	"name": "r-plan",
	"type": "release",
	"enabled": false,
	"project": "default",
	"stale": false,
	"strategies": [
		{
			"name": "flexibleRollout",
			"constraints": [
				{
					"values": [
						"Portugal"
					],
					"inverted": false,
					"operator": "IN",
					"contextName": "country",
					"caseInsensitive": false
				},
				{
					"values": [
						"Portugal",
						"Norway"
					],
					"inverted": false,
					"operator": "IN",
					"contextName": "country",
					"caseInsensitive": false
				}
			],
			"parameters": {
				"groupId": "newOverview",
				"rollout": "100",
				"stickiness": "default"
			},
			"variants": [
				{
					"name": "A",
					"weight": 500,
					"stickiness": "default",
					"weightType": "variable"
				},
				{
					"name": "B",
					"weight": 500,
					"stickiness": "default",
					"weightType": "variable"
				}
			]
		},
		{
			"name": "flexibleRollout",
			"constraints": [],
			"parameters": {
				"groupId": "much_feature",
				"rollout": "25",
				"stickiness": "default"
			},
			"variants": []
		},
		{
			"name": "flexibleRollout",
			"constraints": [],
			"parameters": {
				"groupId": "r-plan",
				"rollout": "100",
				"stickiness": "default"
			},
			"variants": []
		}
	],
	"variants": [],
	"description": null,
	"impressionData": false
},

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[chriswk]

LGTM

[chriswk]

Still looks good. Also more honest about enabled/disabled