feat(bff): load x-forwarded-access-token in cluster setup

[ederign]

load x-forwarded-access-token in cluster setup

Description

In this PR:

• middleware.go: load the bearerToken from x-forwarded-access-token and did a small refactoring to avoid leaking k8s client api;
• k8s.go: move the rest.inclusterConfig logic here for better encapsulation
• apiUtils.go: add the token parameter to the header also in calls where content type is set,

How Has This Been Tested?

1. Built UI and BFF images locally and pushed to kind.
2. Used new 'make kind-deployment' to create and deploy everything to kind.

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages; the author will squash them after approval or in case of manual merges will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.

[lucferbux]

Ok, tested and it works flawlesly! Great addition, we now have a working version of the deployment.

[lucferbux]

/lgtm

[google-oss-prow]

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[alexcreasy]

Great PR, thanks Eder!

[alexcreasy]

I think it's generally better to use the URL api to construct this rather than a string template. You get URL encoding / escaping for free that way.

That said this is a nit so I won't hold the PR up for it :)

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexcreasy, lucferbux

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[alexcreasy]

/lgtm