Migrate OpenSearch to AWS SDK v2

[sc250024]

Description

Fixes #770.

TODOs

Read the Gruntwork contribution guidelines.

• [X] Update the docs.
• [X] Run the relevant tests successfully, including pre-commit checks.
• [X] Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• [x] Include release notes. If this PR is backward incompatible, include a migration guide.
• [x] Attention Grunts - if this PR adds support for a new resource, ensure the nuke_sandbox and nuke_phxdevops jobs in .circleci/config.yml have been updated with appropriate exclusions (either directly in the job or via the .circleci/nuke_config.yml file) to prevent nuking IAM roles, groups, resources, etc that are important for the test accounts.

Release Notes (draft)

Updated opensearchservice to AWS SDK v2

[sc250024]

Results of test locally:

❯ git rev-parse HEAD
e5b3a015fcd1fb924869e377b4e35ec1aca65135

❯ go test -count=1 -parallel=10 ./...
?       github.com/gruntwork-io/cloud-nuke  [no test files]
ok      github.com/gruntwork-io/cloud-nuke/aws  0.614s
?       github.com/gruntwork-io/cloud-nuke/externalcreds    [no test files]
?       github.com/gruntwork-io/cloud-nuke/logging  [no test files]
?       github.com/gruntwork-io/cloud-nuke/telemetry    [no test files]
?       github.com/gruntwork-io/cloud-nuke/v2_migration_report  [no test files]
ok      github.com/gruntwork-io/cloud-nuke/aws/resources    20.338s
ok      github.com/gruntwork-io/cloud-nuke/commands 0.735s
ok      github.com/gruntwork-io/cloud-nuke/config   0.473s
ok      github.com/gruntwork-io/cloud-nuke/report   0.881s
ok      github.com/gruntwork-io/cloud-nuke/ui   1.044s
ok      github.com/gruntwork-io/cloud-nuke/util 1.124s