ErrorHandlerService should be use on every server request

[leomendoza123]

Let's make sure all calls to the backend pipe the ErrorHandlerService and do the retry(3) if an error is thrown.

This requires us to fix the following endpoints, and make sure all other server calls catch errors with this service.

orcid-angular/src/app/core/disco/disco.service.ts

Lines 13 to 17 in de1e100

	getDiscoFeed(): Observable<Institutional[]> {
	return this._http.get<Institutional[]>(
	environment.BASE_URL + 'Shibboleth.sso/DiscoFeed'
	)
	}

and

orcid-angular/src/app/core/togglz/togglz.service.ts

Lines 16 to 20 in de1e100

	private getConfig() {
	return this._http.get<Config>(environment.API_WEB + 'config.json', {
	withCredentials: true,
	})
	}

[leomendoza123]

An instance of correct use is

orcid-angular/src/app/core/register/register.service.ts

Lines 46 to 59 in de1e100

	public checkDuplicatedResearcher(names: {
	familyNames: string
	givenNames: string
	}) {
	return this._http
	.get<DuplicatedName[]>(environment.API_WEB + `dupicateResearcher.json`, {
	params: names,
	withCredentials: true,
	})
	.pipe(
	retry(3),
	catchError((error) => this._errorHandler.handleError(error))
	)
	}