aws: Fix CloudFormation update for parameters & capabilities if not modified

[radeksimko]

Based on @olegch's work from #5264

I resolved conflicts, omitted unrelated changes in the build script and enhanced existing acceptance test to cover this bug.

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSCloudFormation_allAttributes'

TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSCloudFormation_allAttributes -timeout 120m
=== RUN   TestAccAWSCloudFormation_allAttributes
--- PASS: TestAccAWSCloudFormation_allAttributes (153.44s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    153.464s

[radeksimko]

I'm merging this myself as it's effectively code from an existing PR (#5264) with improved tests.

Feel free to review this afterwards though.

[ghost]

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