Convert artifact upload test to 1000 individual uploads

[Copilot]

Modified upload-artifact-test-single-upload.yml to stress test individual artifact uploads at scale.

Changes

• Removed number_of_files input parameter - workflow now hardcoded to 1000 files
• File generation - creates exactly 1000 test files via seq 1 1000
• Upload strategy - replaced single batch upload with 1000 individual upload-artifact@v4 steps, each uploading one file

# Before: 1 step uploading all files
- name: Upload all files in a single step
  uses: actions/upload-artifact@v4
  with:
    name: test-${{ inputs.number_of_files }}-files-single-upload
    path: test-files/

# After: 1000 steps, each uploading 1 file
- name: Upload file 1
  uses: actions/upload-artifact@v4
  with:
    name: test-file-1
    path: test-files/file-1.txt
# ... repeated 1000 times

Workflow file expanded from 36 to 6,025 lines.

Original prompt

Ok, make the following modifications to this file:

remove teh parameter, we don't need it. For the step that generates files, have it create 1000 files.

Then, rather than just 1 upload-artifact step, I want 1000 upload-artifact steps, each one loading a single file.

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