fixed accessibility tests on filters

src/app/shared/search/search-filters/search-filter/search-facet-filter-options/search-facet-option/search-facet-option.component.html

@@ -1,7 +1,8 @@
 <a *ngIf="isVisible | async" class="d-flex flex-row"
+   [tabIndex]="-1"
    [routerLink]="[searchLink]"
    [queryParams]="addQueryParams" queryParamsHandling="merge"
-   (click)="announceFilter()" role="button" tabindex="0">
+   (click)="announceFilter()">
   <label class="mb-0 d-flex w-100">
     <input type="checkbox" [checked]="false" class="my-1 align-self-stretch filter-checkbox" role="checkbox" tabindex="0"/>
     <span class="w-100 pl-1 break-facet">

src/app/shared/search/search-filters/search-filter/search-facet-filter-options/search-facet-range-option/search-facet-range-option.component.html

@@ -1,6 +1,7 @@
 <a *ngIf="isVisible | async" class="d-flex flex-row"
+   [tabIndex]="-1"
    [routerLink]="[searchLink]"
-   [queryParams]="changeQueryParams" queryParamsHandling="merge" role="button" tabindex="0">
+   [queryParams]="changeQueryParams" queryParamsHandling="merge">
   <span class="filter-value px-1">{{filterValue.label}}</span>
   <span class="float-right filter-value-count ml-auto">
     <span class="badge badge-secondary badge-pill">{{filterValue.count | dsShortNumber}}</span>

src/app/shared/search/search-filters/search-filter/search-facet-filter-options/search-facet-selected-option/search-facet-selected-option.component.html

@@ -1,6 +1,7 @@
 <a class="d-flex flex-row"
+   [tabIndex]="-1"
    [routerLink]="[searchLink]"
-   [queryParams]="removeQueryParams" queryParamsHandling="merge" role="link" tabindex="0">
+   [queryParams]="removeQueryParams" queryParamsHandling="merge">
   <label class="mb-0 d-flex w-100">
     <input type="checkbox" [checked]="true" class="my-1 align-self-stretch filter-checkbox" role="checkbox" tabindex="0"/>
     <span class="filter-value pl-1 break-facet">