Consolidate CHANGELOG items for 3.12 #18598

Job	Run time
AWS Batch CLI Tests (ubuntu-latest, Python 3.9 AWS Batch CLI Tests)	24s
AWS Batch CLI Tests (ubuntu-latest, Python 3.10 AWS Batch CLI Tests)	25s
AWS Batch CLI Tests (ubuntu-latest, Python 3.11 AWS Batch CLI Tests)	23s
AWS Batch CLI Tests (ubuntu-latest, Python 3.12 AWS Batch CLI Tests)	31s
AWS Batch CLI Tests (ubuntu-latest, Python 3.10 AWS Batch CLI Tests Coverage)	26s
AWS Batch CLI Tests (ubuntu-latest, Code Checks AWS Batch CLI)	50s
CLI Tests (ubuntu-latest, Python 3.9 Tests)	3m 42s
Dependency Check	30s
CLI Tests (ubuntu-latest, Python 3.10 Tests)	3m 25s
CLI Tests (ubuntu-latest, Python 3.11 Tests)	2m 46s
CLI Tests (ubuntu-latest, Python 3.12 Tests)	3m 10s
API Model Validation	1m 30s
CLI Tests (ubuntu-latest, Python 3.10 Tests Coverage)	5m 38s
CLI Tests (ubuntu-latest, Code Checks)	1m 38s
CLI Tests (ubuntu-latest, CLI CloudFormation Templates Checks)	47s
External SlurmDBD Template Validation	33s
CLI Tests (ubuntu-latest, API CloudFormation Templates Checks)	23s
CLI Tests (ubuntu-latest, Integration Tests Config Checks)	42s
Shellcheck	4s
	27m 47s

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