James Brunton 3bee6d212e Change pipelines to have 1 input and 1 output (#7121)
# Description of Changes

Change pipelines so that sources and triggers are grouped into a list of
inputs, so you can have a different trigger for each source in the list.
This is necessary because triggers are not universally supported by all
source types. If you wanted to have a pipeline pull from both a folder
and an S3 bucket, the current system allows you to choose "Folder Watch"
as the trigger, which will either do nothing or crash when it's paired
with the S3 bucket.

I've got reservations about actually allowing different triggers for
every source because it allows for user workflows that I don't believe
exist, like "I want this folder to be polled every minute and this other
one to be polled every hour, but they should run the same tools and
should output to the same place". Because of this (with agreement from
Connor, Anthony and Matt) I've changed this PR to artificially limit
pipelines to having 1 input & output at this stage. The backend is still
shaped to support multiple inputs & outputs so it should be trivial to
re-add support for them in the future if we decide we want to, but the
UI can be much simpler and easier to understand with just 1 input and
output.

<img width="1262" height="521" alt="image"
src="https://github.com/user-attachments/assets/809e6803-9f99-436d-9aeb-52dddf0906ff"
/>
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Stirling PDF - The Open-Source PDF Platform

Stirling PDF is a powerful, open-source PDF editing platform. Run it as a personal desktop app, in the browser, or deploy it on your own servers with a private API. Edit, sign, redact, convert, and automate PDFs without sending documents to external services.

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