Correctly update write-only properties.

[ewbankkit]

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When updating a resource via the Cloud Control API write-only property changes must be sent as add, not update.
The safest way to do this is to null out any write-only attributes in the "pre" state before comparing with "post" state and building the JSON patch document.

Closes #1149.
Closes #1377.
Closes #1021.
Closes #1426.
Closes #1399.

% TF_LOG=ERROR make testacc PKG_NAME=internal/aws/ec2 TESTARGS='-run=TestAccAWSEC2LaunchTemplate_update'
TF_ACC=1 go test ./internal/aws/ec2 -v -count 1 -parallel 20 -run=TestAccAWSEC2LaunchTemplate_update -timeout 180m
=== RUN   TestAccAWSEC2LaunchTemplate_update
=== PAUSE TestAccAWSEC2LaunchTemplate_update
=== CONT  TestAccAWSEC2LaunchTemplate_update
--- PASS: TestAccAWSEC2LaunchTemplate_update (135.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-awscc/internal/aws/ec2	136.668s

% TF_LOG=ERROR make testacc PKG_NAME=internal/aws/secretsmanager TESTARGS='-run=TestAccAWSSecretsManagerSecret_'
TF_ACC=1 go test ./internal/aws/secretsmanager -v -count 1 -parallel 20 -run=TestAccAWSSecretsManagerSecret_ -timeout 180m
=== RUN   TestAccAWSSecretsManagerSecret_basic
=== PAUSE TestAccAWSSecretsManagerSecret_basic
=== RUN   TestAccAWSSecretsManagerSecret_disappears
=== PAUSE TestAccAWSSecretsManagerSecret_disappears
=== RUN   TestAccAWSSecretsManagerSecret_update
=== PAUSE TestAccAWSSecretsManagerSecret_update
=== CONT  TestAccAWSSecretsManagerSecret_basic
=== CONT  TestAccAWSSecretsManagerSecret_update
=== CONT  TestAccAWSSecretsManagerSecret_disappears
--- PASS: TestAccAWSSecretsManagerSecret_basic (24.65s)
--- PASS: TestAccAWSSecretsManagerSecret_disappears (31.33s)
--- PASS: TestAccAWSSecretsManagerSecret_update (35.65s)
PASS
ok  	github.com/hashicorp/terraform-provider-awscc/internal/aws/secretsmanager	36.459s

% TF_LOG=ERROR make testacc PKG_NAME=internal/aws/iam TESTARGS='-run=TestAccAWSIAMUser_updatePassword'
TF_ACC=1 go test ./internal/aws/iam -v -count 1 -parallel 20 -run=TestAccAWSIAMUser_updatePassword -timeout 180m
=== RUN   TestAccAWSIAMUser_updatePassword
=== PAUSE TestAccAWSIAMUser_updatePassword
=== CONT  TestAccAWSIAMUser_updatePassword
--- PASS: TestAccAWSIAMUser_updatePassword (117.05s)
PASS
ok  	github.com/hashicorp/terraform-provider-awscc/internal/aws/iam	117.773s