Refactor workload.py

[jennyhickson]

PR Summary

Sci/Tech Reviewer:
Code Reviewer: @james-bruten-mo

I've pulled the code for interacting with a github project into its own module as I would like to use this for a new script too. I've refactored workload.py to use this, and modified the interface to hopefully make it a little more generic. I've also removed the hardcoded list of repositories from workload.py, instead now including columns in the SSD table for all repos that have PRs in the project so that everything is included. This is lots at the moment as we had some wide-reaching workflow updates, but hopefully in the future this will actually reduce the size of the table to not include empty columns.

I've also updated the repository list in the manage milestones list to be more complete and fixed a bug with "'s.

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[james-bruten-mo]

Nice use of the classmethod!
A couple of minor suggestions

[james-bruten-mo]

Suggested change

	def from_github(cls, capture: bool = False, file: Path = None) -> "ProjectData":
	def from_github(cls, capture: bool = False, file: Path = None) -> ProjectData:

And then you'll need from __future__ import annotations. You actually don't need the import at python 14.0, but we're not commonly using that yet

[james-bruten-mo]

Suggested change

	output = subprocess.run(command.split(), capture_output=True, timeout=180)
	output = subprocess.run(shlex.split(command), capture_output=True, timeout=180)

and import shlex - I learnt this one recently, it's great!

[james-bruten-mo]

Suggested change

	data = {}
	data = defaultdict(list)

with from collections import defaultdict

And then below there's no need to check if repo is in data. Just do data[repo].append(pull_request) and it'll create it