chore: Updated log level from error to debug in recordStatus in apisix_upstream.go

[sreeram-venkitesh]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

Fixes #2260. Based on the comment #2260 (comment), I've updated one of the error logs to debug level. I was not able to reproduce the error logs given by @ikatlinski locally though. I tried creating both Routes and Upstream objects.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[sreeram-venkitesh]

@Revolyssup @pottekkat: I'd love some guidance on how I can take this forward. Currently in the PR I've only updated a single log line which was mentioned as for sure not an error and warn, but rather info or debug in #2260.

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