Unconditionally enable api termination when deleting aws_instance

[tmccombs]

When we delete an ec2 instance, make sure that we turn off disabled api
termination, so that deletion always works.

Fixes #19275

Alternative to (and conflicts with) #19276

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[zhelding]

Pull request #21306 has significantly refactored the AWS Provider codebase. As a result, most PRs opened prior to the refactor now have merge conflicts that must be resolved before proceeding.

Specifically, PR #21306 relocated the code for all AWS resources and data sources from a single aws directory to a large number of separate directories in internal/service, each corresponding to a particular AWS service. This separation of code has also allowed for us to simplify the names of underlying functions -- while still avoiding namespace collisions.

We recognize that many pull requests have been open for some time without yet being addressed by our maintainers. Therefore, we want to make it clear that resolving these conflicts in no way affects the prioritization of a particular pull request. Once a pull request has been prioritized for review, the necessary changes will be made by a maintainer -- either directly or in collaboration with the pull request author.

For a more complete description of this refactor, including examples of how old filepaths and function names correspond to their new counterparts: please refer to issue #20000.

For a quick guide on how to amend your pull request to resolve the merge conflicts resulting from this refactor and bring it in line with our new code patterns: please refer to our Service Package Refactor Pull Request Guide.

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccEC2Instance_disableAPITermination\|TestAccEC2Instance_basic' PKG=ec2 ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 2  -run=TestAccEC2Instance_disableAPITermination\|TestAccEC2Instance_basic -timeout 180m
=== RUN   TestAccEC2Instance_basic
=== PAUSE TestAccEC2Instance_basic
=== RUN   TestAccEC2Instance_disableAPITerminationFinalFalse
=== PAUSE TestAccEC2Instance_disableAPITerminationFinalFalse
=== RUN   TestAccEC2Instance_disableAPITerminationFinalTrue
=== PAUSE TestAccEC2Instance_disableAPITerminationFinalTrue
=== CONT  TestAccEC2Instance_basic
=== CONT  TestAccEC2Instance_disableAPITerminationFinalTrue
--- PASS: TestAccEC2Instance_disableAPITerminationFinalTrue (124.33s)
=== CONT  TestAccEC2Instance_disableAPITerminationFinalFalse
--- PASS: TestAccEC2Instance_basic (124.47s)
--- PASS: TestAccEC2Instance_disableAPITerminationFinalFalse (165.54s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	294.127s

[ewbankkit]

@tmccombs Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.16.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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