Improve zsh completion script generation #27

Job	Run time
Validate Format Config	9s
CMake Build	44s
Test / Linux (5.8 - jammy)	56s
Test / Linux (5.9 - jammy)	59s
Test / Linux (5.10 - jammy)	1m 4s
Test / Linux (6.0 - jammy)	1m 10s
Test / Linux (nightly-main - jammy)	1m 25s
Test / Linux (nightly-6.1 - jammy)	1m 45s
Test / Windows (6.0 - windows-2022)	16m 44s
Test / Windows (nightly - windows-2019)	10m 46s
Test / Windows (nightly-6.1 - windows-2019)	11m 7s
Soundness / Documentation check	1m 3s
Soundness / API breakage check	1m 1s
Soundness / Broken symlinks check	3s
Soundness / Format check	38s
Soundness / License headers check	0s
Soundness / Python lint check	5s
Soundness / Shell check	0s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	5s
	49m 48s

Provide feedback