Improve Azure startup time and fix command palette (#5761)

* Improve Azure startup time and fix command palette
- Improvement (but not full fix) for #4732 where Azure startup is very slow.
This speeds the startup by up to 5 seconds by
  - Changing from fixed 5 second initial wait time to a promise to check for accounts
  - Using the accounts changed notification to send a message when accounts are ready. This is usually what will "win out" since Azure seems to load before the Account Providers are set up.
- Remove right-click actions from the command palette.
- Rename Azure actions so it's clear what they are in the command palette.

* Remove coveralls task while investigating how to make optional task

* Add void return type

extensions/azurecore/package.json

@@ -118,6 +118,33 @@
 			]
 		},
 		"menus": {
+			"commandPalette": [
+				{
+					"command": "azure.resource.signin",
+					"when": "true"
+				},
+				{
+					"command": "azure.resource.refreshall",
+					"when": "true"
+				},
+				{
+					"command": "azure.resource.selectsubscriptions",
+					"when": "false"
+				},
+				{
+					"command": "azure.resource.refresh",
+					"when": "false"
+				},
+				{
+					"command": "azure.resource.connectsqlserver",
+					"when": "false"
+				},
+				{
+					"command": "azure.resource.connectsqldb",
+					"when": "false"
+				}
+
+			],
 			"view/title": [
 				{
 					"command": "azure.resource.signin",