[Core] Add different request lib to telemetry_analytics in place of $http

[justinkambic]

Summary

Resolves #49263.

As part of our 7.5 testing we discovered that our routing was broken. This PR aims to address that without breaking the upstream code for other consumers. The existing code is planned to be decommissioned in 7.6 anyway, and the ultimate root of the cause is due to an Angular 2 dependency.

Testing

There are two main areas to test when evaluating the performance of this patch:

Server

We need to make sure that the report still gets to the server in the same format it was before. Testing this should be pretty straightforward.

1. Before you check out this patch, do this on master:
2. Add the following line here:

console.log(JSON.stringify(report, null, 2));

3. Open up the Uptime app with some monitors (ping me for help with configuring Heartbeat)
4. Navigate to the monitor page (you should be able to observe the bug this PR is fixing on master)
5. Look at your server output and store the result of our console.log() call
6. Checkout this patch and repeat the process. Ensure that the reports we receive are identical

Client

You can view the broken functionality on the linked issue. Check that this doesn't happen for you on this patch branch.

0. Open your browser's network console
1. Load this patch with some Heartbeat monitors (ping me if you need help setting up Heartbeat)
2. Navigate to the Monitor page for one of your monitors
3. Wait until you see a call to report, like below:
   
4. If the app's route hasn't reset like in the linked issue, the patch is working as desired

Additional concerns

@Bamieh I'm interested in your feedback on the code responsible for the post. I imported Axios but if there's a preferred method of doing it please request the change. It seems like most of this code will be deleted in the next release anyway, but I want to make sure we do things appropriately.

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[andrewvc]

Seems to work, passes the smoke test.

[shahzad31]

LGTM !

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 8a72de5

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 219dfe0

[justinkambic]

@elasticmachine merge upstream

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 57c6fac

[justinkambic]

@elasticmachine merge upstream

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 5b99aab

[Bamieh]

LGTM

[justinkambic]

Backported to:

• 7.5/7.5.0 6a13a97
  [7.5] [Core] Add different request lib to telemetry_analytics in place of $http (#49671) #49888
• 7.x/7.6.0 889c0a7
  [7.x] [Core] Add different request lib to telemetry_analytics in place of $http (#49671) #49887