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/platform/capabilities/test/common/testCapabilitiesService.ts

@@ -14,6 +14,7 @@ import { mssqlProviderName } from 'sql/platform/connection/common/constants';
 
 export class TestCapabilitiesService implements ICapabilitiesService {
 
+	private pgsqlProviderName = 'PGSQL';
 	public _serviceBrand: undefined;
 
 	public capabilities: { [id: string]: ProviderFeatures } = {};
@@ -99,7 +100,13 @@ export class TestCapabilitiesService implements ICapabilitiesService {
 			displayName: 'MSSQL',
 			connectionOptions: connectionProvider,
 		};
+		let pgSQLCapabilities = {
+			providerId: this.pgsqlProviderName,
+			displayName: this.pgsqlProviderName,
+			connectionOptions: connectionProvider,
+		};
 		this.capabilities[mssqlProviderName] = { connection: msSQLCapabilities };
+		this.capabilities[this.pgsqlProviderName] = { connection: pgSQLCapabilities };
 	}
 
 	/**