Add service plan list to service pages

[richard-cox]

• Add service plan tab containing service plan list to service pages
• Fixed issue where space scoped services were incorrectly showing 'not visible' (wired in service broker)
• Refactored common code in services service and create instance service, now in a common helper file
• Commented out a lot of unused code in services service. Leaving this in for a few iterations until we're sure it's not needed
• fixes Enable viewing/comparing service plan details without starting to create an instance #3078
• Note... service plan costs can be tested by tweaking the following

 export const populateServicePlanExtraTyped = (servicePlan: APIResource<IServicePlan>): APIResource<IServicePlan> => {
   if (servicePlan.entity.extraTyped) {
     return servicePlan;
   }
+
+  servicePlan.entity.free = false;
+  servicePlan.entity.extra = JSON.stringify({
+    costs: [
+      {
+        'amount': {
+          'usd': 99.0
+        },
+        'unit': 'MONTHLY'
+      },
+      {
+        'amount': {
+          'usd': 0.99
+        },
+        'unit': '1GB of messages over 20GB'
+      }
+    ]
+  });

[cfdreddbot]

✅ Hey richard-cox! The commit authors and yourself have already signed the CLA.

[codecov]

Codecov Report

Merging #3275 into v2-master will increase coverage by 0.21%.
The diff coverage is 75.92%.

@@              Coverage Diff              @@
##           v2-master    #3275      +/-   ##
=============================================
+ Coverage      70.85%   71.06%   +0.21%     
=============================================
  Files            642      649       +7     
  Lines          28323    28520     +197     
  Branches        6441     6504      +63     
=============================================
+ Hits           20067    20269     +202     
+ Misses          8256     8251       -5

[richard-cox]

• Merge issues
• Plan costs issue

[nwmac]

LGTM