backend/oss: Ignore the getting oss endpoint error and using string concat instead; Improves the error message level

[xiaozhu36]

This PR aims to fix getting oss endpoint error caused by network connection failed and other reasons. This error will break oss backend process. Considering all of oss endpoints have followed up pattern oss-<RegionId>.aliyuncs.com, above error can be ignored.

Fixes #

Target Release

1.4.x

Draft CHANGELOG entry

ENHANCEMENTS

• backend/oss: Ignore the getting oss endpoint error and using string concat instead; Improves the error message level

[crw]

Thanks for this submission, I'll notify the core team.

[alisdair]

Happy to merge this if you can fix the gofmt error! Please run gofmt on these files and push a new commit.

[alisdair]

Thank you!

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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