ci: Add check for cilium error logs to cilium nightly pipeline

[jpayne3506]

Reason for Change:

Adds an additional level of alerting for breaking changes occurring in upstream cilium.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added

Notes:

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[vipul-21]

If we want to test the cilium logs for error, we can use the connectivity test for that. They have check log error and specify the log-check-levels as error so that it does not fail on warning.

[jpayne3506]

https://github.com/cilium/cilium/pull/36231/files , got it. I think this only checks agent logs, so for now we can still leverage this for operator.