extensions/microsoft-authentication/src/AADHelper.ts/AzureActiveDirectoryService/removeSession
class AzureActiveDirectoryService:	public async removeSession(sessionId: string): Promise<vscode.AuthenticationSession | undefined> {
		Logger.info(`Logging out of session '${sessionId}'`);
		const token = this.removeInMemorySessionData(sessionId);
		let session: vscode.AuthenticationSession | undefined;
		if (token) {
			session = this.convertToSessionSync(token);
		}

		if (this._tokens.length === 0) {
			await this._keychain.deleteToken();
		} else {
			this.storeTokenData();
		}

		return session;
	}