feat: added kubeconfig in analyze request input

[lili-wan]

Closes k8sgpt-ai/k8sgpt#1271

📑 Description

we would like to call analyze API on a remote cluster from a central platform. This has been discussed in the k8sgpt channel with Alex, https://k8sgpt.slack.com/archives/C050SKW7SHF/p1728506662655359

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[lili-wan]

Hi @AlexsJones , could you please help to take a look at the PR? the error message looks misleading as I did not touch that part of the code and my local build/test has passed, thanks!

[AlexsJones]

Before we do this @lili-wan I just want to challenge a thought here - Should we be passing the raw kubeconfig like this over rpc or should we point it to another secret in the cluster. WDYT?

[lili-wan]

Before we do this @lili-wan I just want to challenge a thought here - Should we be passing the raw kubeconfig like this over rpc or should we point it to another secret in the cluster. WDYT?

Hi Alex, thanks for replying the message, yes, for open source that would be more secure. I can update the field to take a secret name and add a namespace name where the secret lives, does that sound good?