KIC-Konnect: collect and upload status of controlled kong gateway instances to Konnect

[randmonkey]

Is there an existing issue for this?

• I have searched the existing issues

Problem Statement

Split from #3438. This issue is created for collecting status of managed kong gateway instances. KIC should collect status of all the kong gateway instances. The status would include:

• hostnames (usually pod names, but not 100% the same)
• version of each kong instance (usually all the same if there are multiple; but should consider if multiple versions)
• compatibility status (not included in MVP phase)

Proposed Solution

Get status of kong gateway instances (pods) from endpoints of configured service namespace and name of kong proxy in publish-service flag (or some new flags, because the publish-service is not a required flag).

Additional information

No response

Acceptance Criteria

• KIC could get pod name and version of managed kong gateway instance(s)
• KIC could upload status of managed kong gateway instance(s)
• KIC could delete the outdated kong gateway instances in Konnect runtime group

[randmonkey]

fixed by #3587.