[Fleet] Remove default filter from elastic agent (#1547)

Author: nchaulet

packages/elastic_agent/kibana/dashboard/elastic_agent-f47f18cc-9c7d-4278-b2ea-a6dee816d395.json

@@ -4,30 +4,7 @@
  "hits": 0,
  "kibanaSavedObjectMeta": {
  "searchSourceJSON": {
- "filter": [
- {
- "$state": {
- "store": "appState"
- },
- "meta": {
- "alias": null,
- "controlledBy": "1628695092511",
- "disabled": false,
- "indexRefName": "kibanaSavedObjectMeta.searchSourceJSON.filter[0].meta.index",
- "key": "host.name",
- "negate": false,
- "params": {
- "query": "docker-fleet-agent"
- },
- "type": "phrase"
- },
- "query": {
- "match_phrase": {
- "host.name": "docker-fleet-agent"
- }
- }
- }
- ],
+ "filter": [],
  "highlightAll": true,
  "query": {
  "language": "kuery",