Fix(Merge): rework merge process to prevent it from stopping

[stonebuzz]

Check before insert if a glpi_plugin_jamf_devices already exist

To prevent this

[2024-07-12 16:06:42] glpisqllog.ERROR: DBmysql::doQuery() in /mnt/diskhome/home/htdocs/src/DBmysql.php line 403
  *** MySQL query error:
  SQL: INSERT INTO `glpi_plugin_jamf_devices` (`itemtype`, `items_id`, `udid`, `jamf_type`, `jamf_items_id`) VALUES ('Computer', '401', 'xxx-xxxx-xxxx-xxxx-xxx-', 'MobileDevice', '44')
  Error: Duplicate entry 'Computer-401' for key 'glpi_plugin_jamf_devices.unicity'
  Backtrace :
  src/DBmysql.php:1381                               DBmysql->doQuery()
  marketplace/jamf/ajax/merge.php:118                DBmysql->insert()

Move in global try/catch to prevent process from stopping during API fetch and to be able to 'list' all device irrecoverable

Client error: `GET https://xxxxxxx.jamfcloud.com/api//v2/mobile-devices/82/detail` resulted in a `404 Not Found` response:
{
  "httpStatus" : 404,
  "errors" : [ {
    "code" : "INVALID_ID",
    "description" : "Not Found",
    "id" : "0",
    (truncated...)

[cconard96]

Without throwing the exception here, you aren't able to catch the case where the API doesn't return the data in the try/catch.