kubeflow: disable codecov reporting GHA step

[tarilabs]

this take immediate action to avoid failed builds due to this specific GHA step.

Description

Currently builds are failing on main as trying to report coverage data to Codecov which is not generally enabled in Kubeflow org.

How Has This Been Tested?

n/a

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• [n/a] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [n/a] The developer has manually tested the changes and verified that the changes work

[lampajr]

lgtm

[lampajr]

/lgtm

[google-oss-prow]

@lampajr: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[google-oss-prow]

@tarilabs: you cannot LGTM your own PR.

In response to this:

/approve
/lgtm

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[rareddy]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lampajr, rareddy, tarilabs

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