extensions/microsoft-authentication/src/keychain.ts/Keychain/tryMigrate
class Keychain:	async tryMigrate(): Promise<string | null> {
		try {
			const oldValue = await this.keytar.getPassword(OLD_SERVICE_ID, ACCOUNT_ID);
			if (oldValue) {
				await this.setToken(oldValue);
				await this.keytar.deletePassword(OLD_SERVICE_ID, ACCOUNT_ID);
			}

			return oldValue;
		} catch (_) {
			// Ignore
			return Promise.resolve(null);
		}
	}