chore[test]: add macos to test matrix

[DanielSchiavini]

What I did

• Expanded the matrix to include macos and windows tests
• Removed unnecessary lines from the matrix definition

How I did it

• All default values must be in the top-level matrix definition
• The includes section should contain alternative runs - these will not have all default values defined
  • Therefore reading from the matrix requires passing default values again
  • However we can still delete a lot of repetition

How to verify it

• Tests should pass. We should have 2 extra jobs and the existing ones should keep on existing.

Commit message

- Expanded the matrix to include macos and windows tests
- Refactor the matrix and removed unnecessary lines
- Remove now-redundant windows job

Note that all because of the way github creates matrix jobs, default
values must be in the top-level matrix definition. The includes section
should contain alternative runs - these will not have all default values
defined, therefore reading from the matrix requires passing default
values again.

Description for the changelog

N/A

Cute Animal Picture

[charles-cooper]

let's put the OS in the front of the job name. we can also drop it in the default case, we only need to distinguish for windows + macos

[charles-cooper]

looks good, thanks!