[ElastiCache] Add support for AuthenticationMode for create_user #11121

Job	Run time
Caching (3.8)	15s
Caching (3.9)	7s
Caching (3.10)	9s
Caching (3.11)	10s
Caching (3.12)	8s
Caching (3.13)	15s
Linting (3.8)	3m 57s
Linting (3.9)	3m 53s
Linting (3.10)	3m 14s
Linting (3.11)	2m 56s
Linting (3.12)	3m 4s
Linting (3.13)	3m 4s
jstest / test	1m 8s
javatest / test	1m 15s
rubytest / test (3.3)	1m 2s
dotnettest / test	1m 43s
terraformexamplestest / Find Jobs	6s
test / test (3.8)	18m 27s
testproxy / test (ubuntu-latest, 3.10)	4m 32s
test / test (3.9)	17m 17s
testserver / test (3.8)	18m 11s
testproxy / test (ubuntu-latest, 3.11)	4m 42s
test / test (3.10)	17m 19s
testserver / test (3.9)	19m 23s
testproxy / test (ubuntu-latest, 3.12)	4m 32s
test / test (3.11)	16m 18s
testserver / test (3.10)	16m 54s
testproxy / test (windows-latest, 3.10)	6m 14s
testserver / test (3.11)	16m 23s
test / test (3.12)	17m 19s
testproxy / test (windows-latest, 3.11)	6m 28s
test / test (3.13)	17m 14s
testproxy / test (windows-latest, 3.12)	6m 35s
testserver / test (3.12)	17m 1s
terraformexamplestest / test (acm)	4m 31s
terraformexamplestest / test (autoscaling)	2m 55s
terraformexamplestest / test (awslambda)	3m 55s
terraformexamplestest / test (cloudfront)	4m 4s
terraformexamplestest / test (codebuild)	2m 54s
terraformexamplestest / test (ds)	3m 55s
terraformexamplestest / test (ec2)	3m 28s
terraformexamplestest / test (elb)	3m 44s
terraformexamplestest / test (iam)	2m 48s
terraformexamplestest / test (rds)	4m 1s
terraformexamplestest / test (route53)	4m 14s
terraformexamplestest / test (sqs)	3m 42s
terraformexamplestest / test (wafv2)	3m 22s
	4h 58m 48s

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