Consolidate CHANGELOG items for 3.12 #18597

Job	Run time
AWS Batch CLI Tests (ubuntu-latest, Python 3.9 AWS Batch CLI Tests)	25s
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)	30s
AWS Batch CLI Tests (ubuntu-latest, Python 3.12 AWS Batch CLI Tests)	33s
AWS Batch CLI Tests (ubuntu-latest, Python 3.10 AWS Batch CLI Tests Coverage)	24s
AWS Batch CLI Tests (ubuntu-latest, Code Checks AWS Batch CLI)	52s
CLI Tests (ubuntu-latest, Python 3.9 Tests)	3m 36s
CLI Tests (ubuntu-latest, Python 3.10 Tests)	3m 19s
CLI Tests (ubuntu-latest, Python 3.11 Tests)	2m 53s
CLI Tests (ubuntu-latest, Python 3.12 Tests)	3m 3s
CLI Tests (ubuntu-latest, Python 3.10 Tests Coverage)	5m 25s
CLI Tests (ubuntu-latest, Code Checks)	1m 43s
CLI Tests (ubuntu-latest, CLI CloudFormation Templates Checks)	46s
CLI Tests (ubuntu-latest, API CloudFormation Templates Checks)	23s
CLI Tests (ubuntu-latest, Integration Tests Config Checks)	43s
Dependency Check	27s
API Model Validation	1m 33s
External SlurmDBD Template Validation	35s
Shellcheck	3s
	27m 38s

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