Cover replaceOnChanges with a test

[t0yv0]

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Issue details

Resource option replaceOnChanges functionality does not seem to be covered by tests, it would be great to add.

We unfortunately do not seem to have good prior art of testing it in pulumi/pulumi.

I found this: sdk/nodejs/tests/runtime/langhost/cases/066.replace_on_changes/index.js

Technically what we're testing here is that:

• the user can express replaceOnChanges option
• and in it propagates as such to the engine

So perhaps we can get a way with a mocks-based test that only exercises the SDK, though a full integration test is also an option here.

Affected area/feature