Y24-090 Donor pooling - only one source plate

[KatyTaylor]

User story
As a user of the scRNA Core pipeline, I would like the donor pooling step (into the LRC PBMC Pools plate) to allow only one source plate.

This change is due to the decision being taken to use the GEM-X chip rather than the HT chip, which has fewer wells (and therefore fewer pools on this upstream plate).

Who are the primary contacts for this story
Katy, Abdullah, Abby

Who is the nominated tester for UAT
Abby

Acceptance criteria
To be considered successful the solution must allow:

• There is no interstitial page when creating the LRC PBMC Pools plate - the user does not have to scan in the source plates.
• Put a comment in a relevant place in the code to mitigate against losing the work that we are removing here - e.g. pointing to a git commit where the page is present - because it's possible we may want to reinstate the page in future (Cardinal project main phase).

[KatyTaylor]

Put on hold due to this from Abby in Slack:

Hi, please could I also just ask you to hold off on [this story]
The reason for this is that I need to check with Lesley when she's back but yesterday it was mentioned that Cardinal may want to pool 2 plates together to then load on the GEM-X chips so I wouldn't want you to remove already built in functionality needlessly.

[KatyTaylor]

Removed the on hold label - decision documented here - #1377 (comment)