Update fetch and generate scripts for reflection #29

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Soundness / Check generated code	1m 50s
Soundness / Swift license headers check	3s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 30s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	1m 25s
Soundness / License headers check	2s
Soundness / Format check	35s
Soundness / Python lint check	4s
Soundness / Shell check	35s
Soundness / Unacceptable language check	5s
Soundness / YAML lint check	5s
Cxx interop / Cxx interop / Linux (6.0)	1m 22s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 32s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 30s
Unit tests / Unit tests / Linux (6.0)	1m 14s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 22s
Unit tests / Unit tests / Linux (nightly-main)	1m 22s
	14m 43s

Provide feedback