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.nls.json

@@ -27,7 +27,6 @@
 	"config.noSystemKeychain": "Disable system keychain integration. Credentials will be stored in a flat file in the user's home directory.",
 	"config.piiLogging": "Should Personally Identifiable Information (PII) be logged in the Azure Accounts output channel and the output channel log file.",
 	"config.loggingLevel": "[Optional] The verbosity of logging for the Azure Accounts extension.",
-	"config.authenticationLibrary": "The library used for the AAD auth flow. Please restart ADS after changing this option.",
 	"config.customProviderSettings": "Setting containing custom Azure authentication endpoints. Changes to this setting require a restart to take effect.",
 	"config.providerSettingsTitle": "Provider Settings",
 	"config.providerSettingsName": "Cloud Name",