Remove hardcoded AMI IDs from launch_config data source

[YakDriver]

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Central management issue: #12994

Release note for CHANGELOG:

NONE

The output from acceptance testing:

% make testacc TESTARGS='-run=TestAccAWSLaunchConfigurationDataSource_'  
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -count 1 -parallel 20 -run=TestAccAWSLaunchConfigurationDataSource_ -timeout 120m
?   	github.com/terraform-providers/terraform-provider-aws	[no test files]
=== RUN   TestAccAWSLaunchConfigurationDataSource_basic
=== PAUSE TestAccAWSLaunchConfigurationDataSource_basic
=== RUN   TestAccAWSLaunchConfigurationDataSource_securityGroups
=== PAUSE TestAccAWSLaunchConfigurationDataSource_securityGroups
=== CONT  TestAccAWSLaunchConfigurationDataSource_basic
=== CONT  TestAccAWSLaunchConfigurationDataSource_securityGroups
--- PASS: TestAccAWSLaunchConfigurationDataSource_basic (37.22s)
--- PASS: TestAccAWSLaunchConfigurationDataSource_securityGroups (49.14s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	50.688s

See AWSAT002

Current stats of acceptance tests for this PR:

Partition	Passing	Failing	Test
us-gov	2	0	With-PR
us-gov	0	2	Pre-PR
standard	2	0	With-PR
standard	2	0	Pre-PR

[bflad]

LGTM 🚀

Output from acceptance testing in AWS Commercial:

--- PASS: TestAccAWSLaunchConfigurationDataSource_securityGroups (13.61s)
--- PASS: TestAccAWSLaunchConfigurationDataSource_basic (22.20s)

Output from acceptance testing in AWS GovCloud (US):

--- PASS: TestAccAWSLaunchConfigurationDataSource_basic (6.58s)
--- PASS: TestAccAWSLaunchConfigurationDataSource_securityGroups (7.82s)

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!