BC-8427- Improve A11y of add and remove member dialog (#3467)

Improves A11y for keyboard and screenreader navigation of the add + remove member dialogs and all dialogs that use the ConfirmationDialog component. 

* add vueuse focus trap
* close dialogs with esc
* add focus trap for add members dialog
* ConfirmationDialog: replace custom dialog with v-dialog
* add focus trap for confirmation dialog
* add tabbable mock for testing focus trap

package.json

@@ -25,6 +25,7 @@
 		"@vuelidate/validators": "^2.0.4",
 		"@vueuse/components": "^10.11.0",
 		"@vueuse/core": "^10.11.0",
+		"@vueuse/integrations": "^12.0.0",
 		"axios": "^1.7.4",
 		"cross-env": "^7.0.3",
 		"dayjs": "^1.11.10",