Remove ADAL Code (#23360)

* initial commit, removed all adal code

* remove all authLibrary references in extension/azurecore

* removed authLibrary references from src/sql

* remove MSAL/ADAL setting option

* wip fixing tests and removing Msal from method names

* fixed tests

* create accountInfo mock

* fix tests

* fix clientApplication mock

* remove clientapplication

* fix compile

* add typing

* wip

* wip

* wip

* fix tree provider

* remove SimpleTokenCache, FileDatabase & tests

* remove remaining adal / authentication library references:

* remove comma from package.nls.json

* fix error fetching subscriptions

* fix tests

* remove getAzureAuthenticationLibraryConfig

* remove adal check

* fix build

* remove test

* undo remove customProviderSettings

* fix bracket

extensions/azurecore/package.json

@@ -115,20 +115,6 @@
               "All"
             ]
           },
-          "azure.authenticationLibrary": {
-            "type": "string",
-            "description": "%config.authenticationLibrary%",
-            "default": "MSAL",
-            "enum": [
-              "ADAL",
-              "MSAL"
-            ],
-            "enumDescriptions": [
-              "Azure Active Directory Authentication Library",
-              "Microsoft Authentication Library"
-            ],
-            "deprecationMessage": "Warning: ADAL has been deprecated, and is scheduled to be removed in a future release. Please use MSAL (default option) instead."
-          },
           "azure.customProviderSettings": {
             "type": "array",
             "description": "%config.customProviderSettings%",