Remove timeout code now that immediate activation will wait on the local Ext Host

[TylerLeonhardt]

Followup from #260061

We can now remove the timeout here

vscode/src/vs/workbench/services/accounts/common/defaultAccount.ts

Lines 266 to 279 in d226599

	private async getSessions(authProviderId: string): Promise<readonly AuthenticationSession[]> {
	for (let attempt = 1; attempt <= 3; attempt++) {
	try {
	return await this.authenticationService.getSessions(authProviderId, undefined, undefined, true);
	} catch (error) {
	this.logService.warn(`[DefaultAccount] Attempt ${attempt} to get sessions failed:`, getErrorMessage(error));
	if (attempt === 3) {
	throw error;
	}
	await timeout(500);
	}
	}
	throw new Error('Unable to get sessions after multiple attempts');
	}