Add support to the Go SDK for invoke transforms. This only adds support
for setting transforms globally, not yet via a resource option, which
resource transforms allow.
---------
Co-authored-by: Will Jones <will@sacharissa.co.uk>
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# Description
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Fixes https://github.com/pulumi/pulumi/issues/15984.
The bug was actually caused by a longstanding mistake in
`_collapse_providers` that didn't iterate the providers correctly if it
was passed as a `dict`. But worth having this test in full to sanity
check the other languages as well.
## Checklist
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Adding some more transform tests. Trying to repro
https://github.com/pulumi/pulumi/issues/15984 although it oddly seems to
be component resource specific. These tests are still worth having and
found some other issues.
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# Description
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Please also include relevant motivation and context. -->
This adds a new experimental feature to the Go SDK to register remote
transform functions. These are currently all prefixed 'X' to show
they're experimental (they can't be in their own package because of
circular dependencies).
These transform functions will run even for resources created inside
MLCs.
## Checklist
- [x] I have run `make tidy` to update any new dependencies
- [x] I have run `make lint` to verify my code passes the lint check
- [x] I have formatted my code using `gofumpt`
<!--- Please provide details if the checkbox below is to be left
unchecked. -->
- [x] I have added tests that prove my fix is effective or that my
feature works
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User-facing changes require a CHANGELOG entry.
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- [x] I have run `make changelog` and committed the
`changelog/pending/<file>` documenting my change
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