Import bucket metadata must show CORS and general errors if any are found

[marktheunissen]

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the Apache 2 license.
By creating this pull request I represent that I have the right to license the
contributions to the project maintainers under the Apache 2 license.

Description

• Fix a bug where any error on the zip file itself (rather than a specific bucket) was not reported, e.g. malformed directory.
• Report whether CORS bucket settings were imported successfully

Motivation and Context

How to test this PR?

Example of failed import errors, with this PR:

0/2 buckets were imported successfully.
Errors:

Name      : BADFORMAT/corsexporttest/cors.xml
  Error:  malformed zip - expecting format bucket/<config.json>

Name      : corsexporttest
  Notification:  ✔
  Quota:  ✔
  CORS:  ✗

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[klauspost]

LGTM 👍🏼

please recheck, I have removed personal imports and pulled in correct ones

[marktheunissen]

@harshavardhana please re-review and merge if happy, thanks.

[zveinn]

LGTM