synthetics - fix private locations name for icmp and tcp monitors

[dominiqueclarke]

Relates to elastic/uptime#475

Please label this PR with one of the following labels, depending on the scope of your change:

• Bug

What does this PR do?

Adds observer.geo.name when defined, such as for private location monitors.

Testing

1. Pull down this PR. In the root of the integrations repo, cd packages/synthetics, run elastic-package clean, then elastic-package build.
2. Once the stack is up, stop kibana using docker desktop management
3. In packages/synthetics directory, run elastic-package stack up --versions 8.4.0-SNAPSHOT -v
4. Check out Kibana branch 8.4
5. Add the following to your local kibana.dev.yml

elasticsearch:
  hosts: ["https://localhost:9200"]
  username: "kibana_system"
  password: "changeme"
xpack.fleet.registryUrl: https://localhost:8080

6. Run curl -k -u elastic:changeme -X POST "https://localhost:9200/_security/user/kibana_system/_password?pretty" -H 'Content-Type: application/json' -d' { "password" : "changeme" } '
7. Run eval "$(elastic-package stack shellinit)"
8. Run export NODE_EXTRA_CA_CERTS=${ELASTIC_PACKAGE_CA_CERT}.
9. Start your local Kibana. Fleet server and agent should now be configured correctly. You can confirm by visiting the fleet page
10. Create a synthetics private location
11. Create an ICMP and TCP monitor for that location
12. Ensure those monitors' results include the custom location name.

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• Start Time: 2022-08-01T19:36:55.301+0000

• Duration: 15 min 3 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6
Skipped	0
Total	6

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Name	Metrics % (covered/total)	Diff
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