Remove build button for colletion upload dialog

Summary of Changes

This mr removes the superfluous build button from the upload dialog. Note the original issue also mentions removing Pause and Reset buttons.

• Pause has already been "removed" as part of different issue: !102 (merged)
• See here for note on reset button: #103 (comment 1515490)

Checklist

• The MR has a clear and concise title
• Code is self-documented and follows style guidelines.
• Automated tests are written and pass successfully.
• Regression tests (e.g. manually triggered system tests, manual GUI/tool tests, ...) are performed to make sure the MR does not break anything (when applicable)
• Readme file is present and up-to-date.

Documentation Updates

Additional Notes

Closes #103 (closed)