Add changes for flavor selection (#8419)

* Add changes for flavor selection

* Use getDefaultProviderId method

* Update default engine user setting description

* Add back check for codeEditor

* Add test for multiple providers

* Removing extra merge line

* Add an attribute to ConnectionProviderProperties for language flavor

Adding a boolean property to ConnectionProviderProperties for providers that are language flavors. When it is set to true, the provider will be part of drop down for changing SQL language flavor.

* Update variable name

* Put logic for removing CMS at one place and remove flag for flavor provider

* Using keys instead of entries

Using Object.keys instead of entries as doing [0] can be error prone if no provider matches.

* Adding logic to check from params

* Updating variable names

* Rename dedup map

* Fix action

src/sql/workbench/services/connection/test/browser/connectionManagementService.test.ts

@@ -729,6 +729,21 @@ suite('SQL ConnectionManagementService tests', () => {
 		}
 	});
 
+	test('getUniqueConnectionProvidersByNameMap should return non CMS providers', () => {
+		let nameToDisplayNameMap: { [providerDisplayName: string]: string } = { 'MSSQL': 'SQL Server', 'MSSQL-CMS': 'SQL Server' };
+		let providerNames = Object.keys(connectionManagementService.getUniqueConnectionProvidersByNameMap(nameToDisplayNameMap));
+		assert.equal(providerNames.length, 1);
+		assert.equal(providerNames[0], 'MSSQL');
+	});
+
+	test('providerNameToDisplayNameMap should return all providers', () => {
+		let expectedNames = ['MSSQL', 'PGSQL'];
+		let providerNames = Object.keys(connectionManagementService.providerNameToDisplayNameMap);
+		assert.equal(providerNames.length, 2);
+		assert.equal(providerNames[0], expectedNames[0]);
+		assert.equal(providerNames[1], expectedNames[1]);
+	});
+
 	test('ensureDefaultLanguageFlavor should not send event if uri is connected', done => {
 		let uri: string = 'Editor Uri';
 		let options: IConnectionCompletionOptions = {