Remove Northstar, Wawastation, Birdshot from CI (#2333)

## About The Pull Request

We don't run these maps, they're already removed from basemap.dm

</details>

## Changelog

🆑 LT3
server: Removed Northstar, Wawastation, and Birdshot from map
configuration cache
/🆑

Co-authored-by: Waterpig <49160555+Majkl-J@users.noreply.github.com>

_maps/birdshot.json

@@ -1,17 +0,0 @@
-{
-	"version": 1,
-	"map_name": "Birdshot Station",
-	"map_path": "map_files/Birdshot",
-	"map_file": "birdshot.dmm",
-	"shuttles": {
-		"cargo": "cargo_skyrat",
-		"ferry": "ferry_kilo",
-		"whiteship": "whiteship_birdshot",
-		"emergency": "emergency_birdshot"
-	},
-	"job_changes": {
-		"Cook": {
-			"additional_cqc_areas": ["/area/station/service/bar", "/area/station/commons/lounge"]
-		}
-	}
-}

_maps/northstar.json

@@ -1,38 +0,0 @@
-
-{
-	"version": 1,
-	"map_name": "NorthStar",
-	"map_path": "map_files/NorthStar",
-	"map_file": "north_star.dmm",
-	"shuttles": {
-		"emergency": "emergency_northstar",
-		"ferry": "ferry_fancy",
-		"cargo": "cargo_northstar",
-		"whiteship": "whiteship_delta"
-	},
-	"space_ruin_levels": 3,
-	"space_empty_levels": 2,
-	"traits": [
-		{
-			"Up": true,
-			"Linkage": "Cross"
-		},
-		{
-			"Up": true,
-			"Down": true,
-			"Baseturf": "/turf/open/openspace",
-			"Linkage": "Cross"
-		},
-		{
-			"Up": true,
-			"Down": true,
-			"Baseturf": "/turf/open/openspace",
-			"Linkage": "Cross"
-		},
-		{
-			"Down": true,
-			"Baseturf": "/turf/open/openspace",
-			"Linkage": "Cross"
-		}
-	]
-}

_maps/wawastation.json

@@ -1,32 +0,0 @@
-{
-	"version": 1,
-	"map_name": "Wawastation",
-	"map_path": "map_files/wawastation",
-	"map_file": "wawastation.dmm",
-	"shuttles": {
-		"cargo": "cargo_box",
-		"ferry": "ferry_fancy",
-		"whiteship": "whiteship_meta",
-		"emergency": "emergency_wawa"
-	},
-	"traits": [
-		{
-			"Up": true,
-			"Baseturf": "/turf/open/misc/asteroid/airless",
-			"Linkage": "Cross"
-		},
-		{
-			"Down": true,
-			"Baseturf": "/turf/open/openspace",
-			"Linkage": "Cross"
-		}
-	],
-	"job_changes": {
-		"Cook": {
-			"additional_cqc_areas": ["/area/station/service/bar", "/area/station/commons/lounge"]
-		},
-		"Captain": {
-			"special_charter": "asteroid"
-		}
-	}
-}