2248 make the uploading of a spreadsheet a background job

[kdp-cloud]

• Harmonizes the spreadsheet upload functionality and dynamic table functionality
• Makes adding / creating samples a background job when > 100 samples
• Closes Make the uploading of a spreadsheet a background job #2248

[Copilot]

Pull Request Overview

This PR introduces background job processing for large sample uploads to improve system performance and user experience. When uploading > 100 samples via spreadsheet, the system now processes them asynchronously instead of blocking the request.

• Refactors sample batch operations to use a new service class SampleBatchProcessor
• Adds background jobs for batch create/update operations when sample count exceeds 100
• Implements email notifications for background job completion
• Adds UI feedback and locking mechanisms during background processing

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
app/services/samples/sample_batch_processor.rb	New service class to handle batch sample operations
app/jobs/samples_batch_create_job.rb	Background job for batch sample creation
app/jobs/samples_batch_update_job.rb	Background job for batch sample updates
app/controllers/samples_controller.rb	Refactored to use new service and jobs with 100-sample threshold
app/controllers/single_pages_controller.rb	Renamed upload action to preview_upload_samples
app/models/sample_type.rb	Added batch upload progress tracking
app/views/single_pages/sample_upload_content.html.erb	Updated UI to handle background jobs and improve error handling
test/ files	Updated tests to reflect new functionality and parameter structure

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