CCM-8508: update to next 15.1.6 and supporting tweaks #2091

Job	Run time
Set CI/CD metadata	4s
Commit stage / Check file format	5s
Commit stage / Check English usage	6s
Commit stage / Check Markdown format	5s
Commit stage / Count lines of code	4s
Commit stage / Detect Terraform Changes	4s
Commit stage / Scan dependencies	25s
Commit stage / Scan secrets	9s
Commit stage / Lint Terraform	0s
Commit stage / TFSec Scan	0s
Test stage / Linting	1m 7s
Test stage / Typecheck	1m 6s
Test stage / Check generated dependencies	42s
Test stage / Unit tests	1m 43s
Test stage / Test coverage	0s
Test stage / Perform static analysis	0s
Acceptance stage	0s
	5m 40s

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