DS-8668: adds check for HTTP 413 status code when importing an SAF file

[nwoodward]

References

• Fixes SAF Import - Batch Import (ZIP) failure due to file size is not clear to end user DSpace#8668
• Companion PR: DS-8668: adds exception handler for when maximum upload size is exceeded DSpace#8735

Description

This PR adds a check for an HTTP 413 response from the backend when importing an SAF file and displays a different message to the user.

Instructions for Reviewers

1. Go to /admin/batch-import
2. Upload an SAF file larger than 512 MB

Checklist

• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes ESLint validation using yarn lint
• My PR doesn't introduce circular dependencies (verified via yarn check-circ-deps)
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.
• If my PR includes new libraries/dependencies (in package.json), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.
• If my PR includes new features or configurations, I've provided basic technical documentation in the PR itself.
• If my PR fixes an issue ticket, I've linked them together.

[tdonohue]

👍 Thanks @nwoodward ! This looks good to me. I've tested it locally by setting the maximum file size to a very small value & attempting an SAF upload. It works as described & shows a more informative error.

For my tests, I simply set this in my local.cfg:

spring.servlet.multipart.max-file-size = 20KB

With this setting, any SAF ZIP file over 20KB throws the error. Also verified when it's unset or set to a larger value, larger files are accepted.