fix cli upgrade mgmt kubeconfig flag

[ddjjia]

Issue #, if available:
#5905

Description of changes:
We decide to separate bug fix and flag deprecation.

eksa upgrade cluster -f mgmt.yaml --kubeconfig cluster.kubeconfig (only kubeconfig is provided)

• set wconfig to provided cluster.kubeconfig
• set mgmtkubeconfig to empty

input --w-config	input --kubeconfig	input file	actual wconfig value	actual mgmtkubeconfig value	expected behavior
	mgmt	mgmt	reset to mgmt	reset to ""	upgrade mgmt
	wl	mgmt	wl	""	error wl kubeconfig doesn't have resource cluster
	mgmt	wl	default location	mgmt	upgrade wl cluster
	wl	wl	default location	wl	error wl kubeconfig doesn't have resource cluster
mgmt		mgmt	mgmt	""	upgrade mgmt
wl		mgmt	wl	""	error wl kubeconfig doesn't have resource cluster
mgmt		wl	mgmt	default location	upgrade wl
wl		wl	wl	default location	upgrade wl
wl	mgmt	wl	wl	mgmt	upgrade wl
mgmt	wl	wl	mgmt	wl	error wl kubeconfig doesn't have resource cluster
wl	mgmt	mgmt	wl	""	error wl kubeconfig doesn't have resource cluster
mgmt	wl	mgmt	mgmt	wl	upgrade mgmt cluster

Testing (if applicable):

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03% ⚠️

Comparison is base (a07878f) 75.65% compared to head (406e8ec) 75.62%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6666      +/-   ##
==========================================
- Coverage   75.65%   75.62%   -0.03%     
==========================================
  Files         473      473              
  Lines       38189    38234      +45     
==========================================
+ Hits        28892    28916      +24     
- Misses       7702     7721      +19     
- Partials     1595     1597       +2     

see 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[vivek-koppuru]

Thanks for showing this matrix! We can in the follow up PR where we deprecate w-config fix how kubeconfig is used

[ddjjia]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ddjjia

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [ddjjia]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ddjjia]

/cherry-pick release-0.17

[eks-distro-pr-bot]

@ddjjia: new pull request created: #6679

In response to this:

/cherry-pick release-0.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.