Upload Codecov report using CLI

[torchiaf]

Summary

Fixes #11106

Occurred changes and/or fixed issues

Technical notes summary

• It re-enables tests coverage upload using the Codecov CLI.
• Using codecov/codecov-action is discouraged (issue available on request)

Areas or cases that should be tested

• Wait for coverage action to be completed, example: https://github.com/rancher/dashboard/actions/runs/9942926643/job/27465670805

• Click on the link from Github action log to be redirected to the Codecov homepage, example:

Areas which could experience regressions

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[cnotv]

I can see the PR got the coverage updated https://app.codecov.io/github/rancher/dashboard/commit/d2f88aa8e3ef3719b7a280b689e4a2164e655b20
The link is in the CI logs.

LGTM