BTMS/BTPS Updates

[slactjohnson]

Description

Update BTMS code to support new bay 2/bay 3 source lines Update BTPS screens to support new bay 2/bay 3 source lines

Motivation and Context

Closes #1256

How Has This Been Tested?

Tested interactively on the system.

Where Has This Been Documented?

The code, this PR, and (soon) Confluence

Screenshots:

New BTPS Screen:

New BTMS Screen (with supporting updates in this PR: https://github.com/pcdshub/btms-ui/pull/12):

Pre-merge checklist

• [x] Code works interactively
• [x] Code contains descriptive docstrings, including context and API
• [x] New/changed functions and methods are covered in the test suite where possible
• [x] Test suite passes locally
• [x] Test suite passes on GitHub Actions
• [x] Ran docs/pre-release-notes.sh and created a pre-release documentation page
• [x] Pre-release docs include context, functional descriptions, and contributors as appropriate