Update codecov.yml to omit generated code

[thunderboltsid]

Everytime we add or modify a CRD, we will fail to meet generated code coverage. The onus of ensuring the correctness of generated code lies on the generator itself. We can, in future, think about generating tests for this code (trust but verify) but, for the time being, it's best to exclude this from metrics.

[nutanix-cn-prow-bot]

@thunderboltsid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-capx-controller-upgrade	3fc7abe	link	false	/test e2e-capx-controller-upgrade

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[adiantum]

/lgtm
/approve

[nutanix-cn-prow-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adiantum, thunderboltsid, tuxtof, yannickstruyf3

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