fix: primitive support for multiple `WWW-Authenticate` response headers (GoogleContainerTools#4187)

[kosi2801]

• fix: try all authenticate methods from the WWW-Authenticate response header until one succeeds

Thank you for your interest in contributing! For general guidelines, please refer to the contributing guide.

Before filing a pull request, make sure to do the following:

• [x] Create a new issue at https://github.com/GoogleContainerTools/jib/issues/new/choose.
• [ ] Ensure that your implementation plan is approved by the team.
  • not yet discussed, implementation is based on local fix of issue
• [ ] Verify that integration tests and unit tests are passing after the change.
  • local docker instance as described in integration test instructions doesn't seem accessible for whatever reason. unit tests pass.
• [x] Address all checkstyle issues. Refer to the style guide.

This helps to reduce the chance of having a pull request rejected.

Fixes #4187 🛠️