[Staleness] API and Component Functionality (#6108)

* initial telemetry api updates for staleness support

* modifying staleness to a subsription style

* fixing variable name

* debuggin

* put the subscribe in the wrong place

* stale class for object views

* temp cyan border for testing

* added staleness to swg, working on stacked plot staleness

* WIP: stacked plot staleness

* reverting, going a different route

* staleness on stacked plots

* plot legend staleness

* remove debug code

* staleness for alphanumerics

* lad table and table set staleness

* overlay plot staleness

* remove debug code

* hardened lad staleness functionality fixed plots without composition bug

* adding staleness to gauges

* renaming telemetry age check functionality so it does not conflict with new staleness functionality

* couple one-off fixes here and there, and WIP for condition sets, moving to telemetry tables to facilitate styling of completed components

* small fix on lad tables, added staleness functionality to tables

* finishing up condition sets

* some cleaning up

* adding border to condition sets when an item is stale

* fixing dub sub

* addressing PR comment, moving repeated code to a function

* robustified the SWG stalenes provider, little fixes here and there as far as cleaning up listeners and... whatnot

* removing debug code

* typo fixes

* cleanin up debug code

* created a simple stalenes mixin for more basic usage in components

* more robustification, if a new staleness subscription happens, will now send the current staleness value if we have it, beefed up example stalenes swg provider

* beefed up staleness mixin a bit to give it more use

* copyright

* cleanin up ladtable code

* cleanin up ladtable code

* cleaning up lad table sets

* some minor updates

* Closes #6109
- New staleness glyph and font CSS added.

* Closes #6109
- Normalized staleness colors as theme constants.
- New mixins for staleness application to view elements.
- Applied staleness styling to all relevant view elements.
- TODO: smoke-test in Show theme.

* adding staleness utils helper, mixin and isStale functionalirty for telemtry api

* Closes #6109
- Refined style for Snow theme.

* need to have one domainObject per stalenes utility

* making sure we handle domains correctly while dealing with staleness

* couple fixes

* moving abort controller logic to a spot where it makes more sense

* added some more info for the StalenesProvider interface docs

* returning undefinded for ifStale requests with no provider

* debuggin

* debuggin

* missed "isStale" call in condtioncollections

* removing debug code and using mixin unsubscribe in gauge

* fixing tests

* more targeted tree item click

Co-authored-by: Charles Hacskaylo <charlesh88@gmail.com>
Co-authored-by: Andrew Henry <akhenry@gmail.com>
Co-authored-by: Scott Bell <scott@traclabs.com>

example/generator/WorkerInterface.js

@@ -25,14 +25,24 @@ define([
 ], function (
     { v4: uuid }
 ) {
-    function WorkerInterface(openmct) {
+    function WorkerInterface(openmct, StalenessProvider) {
         // eslint-disable-next-line no-undef
         const workerUrl = `${openmct.getAssetPath()}${__OPENMCT_ROOT_RELATIVE__}generatorWorker.js`;
+        this.StalenessProvider = StalenessProvider;
         this.worker = new Worker(workerUrl);
         this.worker.onmessage = this.onMessage.bind(this);
         this.callbacks = {};
+        this.staleTelemetryIds = {};
+
+        this.watchStaleness();
     }
 
+    WorkerInterface.prototype.watchStaleness = function () {
+        this.StalenessProvider.on('stalenessEvent', ({ id, isStale}) => {
+            this.staleTelemetryIds[id] = isStale;
+        });
+    };
+
     WorkerInterface.prototype.onMessage = function (message) {
         message = message.data;
         var callback = this.callbacks[message.id];
@@ -83,11 +93,12 @@ define([
     };
 
     WorkerInterface.prototype.subscribe = function (request, cb) {
-        function callback(message) {
-            cb(message.data);
-        }
-
-        var messageId = this.dispatch('subscribe', request, callback);
+        const id = request.id;
+        const messageId = this.dispatch('subscribe', request, (message) => {
+            if (!this.staleTelemetryIds[id]) {
+                cb(message.data);
+            }
+        });
 
         return function () {
             this.dispatch('unsubscribe', {