Admin Token API: Identify Runner Authentication Tokens

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What does this MR do and why?

This MR adds support for identification of runner authentication tokens in the Admin Token API.

Revocation is left out and will be added in a separate MR.

🛠️ with ❤️ at Siemens

References

• Issue: #506513 (closed)
• Epic: &15777
• Docs: https://docs.gitlab.com/ee/api/admin/token.html

MR acceptance checklist

MR Checklist ( @nwittstruck)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides

How to set up and validate locally

1. Enable feature flag via rails c:

Feature.enable(:admin_agnostic_token_finder)

2. You'll need to create a personal access token to access the token and the runner authentication token that you'd like to query:

   1. Create a personal access token with admin_mode and api capabilities. Preferences > Access Tokens > Add a new token
   2. Create a new instance runner to get a runner authentication token to query. Admin > CI / CD > Runners > New instance runner

3. Now you can retrieve information about this token:

curl -k --request POST \
--url 'https://gdk.test:3443/api/v4/admin/token' \
--header 'Authorization: Bearer <Admin Token from Step 2.1>' \
--header 'Content-Type: application/json' \
--data '{"token": "glrt-token-from-step-2.2"}'

{
	"id": 32,
	"description": "instance-runner-example",
	"ip_address": null,
	"active": true,
	"paused": false,
	"is_shared": true,
	"runner_type": "instance_type",
	"name": null,
	"online": null,
	"status": "never_contacted"
}

Related to #506513 (closed)