[Internal] make `ApplyAndExpectData` work with nested set

[nkvuong]

Changes

• Make ApplyAndExpectData work with nested set, instead of just set of strings.

Tests

• [x] make test run locally

[github-actions[bot]]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger: go/deco-tests-run/terraform

Inputs:

• PR number: 4237
• Commit SHA: 470fdfa0eb00d79aac8967d423b2fbd8a7dddf45

Checks will be approved automatically on success.

[eng-dev-ecosystem-bot]

Test Details: go/deco-tests/11867033960