ui: Update mock intention metadata to only include possible values (#14607)

ui/packages/consul-ui/mock-api/v1/connect/_

@@ -97,16 +97,7 @@ ${fake.helpers.randomize([
             "Precedence": ${i + 1},
 ${ fake.random.number({min: 1, max: 10}) > 2 ? `
             "Meta": {
-              "external-source": "${fake.helpers.randomize([
-                'consul-api-gateway',
-                'vault',
-                'nomad',
-                'terraform',
-                'kubernetes',
-                'aws',
-                'lambda',
-                ''
-              ])}"
+              "external-source": "${fake.helpers.randomize(['kubernetes', ''])}"
             },
 ` : `` }
             "CreatedAt": "2018-05-21T16:41:27.977155457Z",

ui/packages/consul-ui/mock-api/v1/connect/intentions/_

@@ -81,7 +81,7 @@ ${fake.helpers.randomize([
     "Precedence": ${fake.random.number({min: 1, max: 100})},
 ${ !legacy && fake.random.number({min: 1, max: 10}) > 2 ? `
     "Meta": {
-      "external-source": "${fake.helpers.randomize(['kubernetes', 'consul-api-gateway'])}"
+      "external-source": "${fake.helpers.randomize(['kubernetes', ''])}"
     },
 ` : `` }
     "CreatedAt": "2018-05-21T16:41:27.977155457Z",

ui/packages/consul-ui/mock-api/v1/connect/intentions/exact

@@ -87,7 +87,7 @@ ${fake.helpers.randomize([
     "Precedence": ${fake.random.number({min: 1, max: 100})},
 ${ (!legacy || source[1] === "external-source") && fake.random.number({min: 1, max: 10}) > 2 ? `
     "Meta": {
-      "external-source": "${fake.helpers.randomize(['kubernetes', 'consul-api-gateway'])}"
+      "external-source": "${fake.helpers.randomize(['kubernetes', ''])}"
     },
 ` : `` }
     "CreatedAt": "2018-05-21T16:41:27.977155457Z",

ui/packages/consul-ui/mock-api/v1/internal/ui/service-topology/_

@@ -86,7 +86,7 @@ ${(Math.random(1) > 0.3) ? `
       "Intention": {
         "Allowed": ${allowed},
         "HasPermissions": ${hasPerms},
-        "ExternalSource": "${fake.helpers.randomize(['vault', 'nomad', 'kubernetes', ''])}",
+        "ExternalSource": "${fake.helpers.randomize(['kubernetes', ''])}",
         "HasExact": ${fake.random.boolean()},
         "DefaultAllow": ${fake.random.boolean()}
       }
@@ -116,7 +116,7 @@ ${(Math.random(1) > 0.3) ? `
       "Intention": {
         "Allowed": ${allowed},
         "HasPermissions": ${hasPerms},
-        "ExternalSource": "${fake.helpers.randomize(['nomad', 'kubernetes', ''])}",
+        "ExternalSource": "${fake.helpers.randomize(['kubernetes', ''])}",
         "HasExact": ${fake.random.boolean()},
         "DefaultAllow": ${fake.random.boolean()}
       }