fix: outputReferenceFallbacks for css/variables formatter

[tkgroot]

Issue #, if available:

If options were provided with outputReferences and outputReferenceFallbacks set to true did not add the fallbacks when running with the css/variables formatter.

Description of changes:

• outputReferenceFallbacks options are passed through to up until the createPropertyFormatter function, which was previously not the case
• add test to verify outputReferenceFallbacks are set
• update test snapshot

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[tkgroot]

created a PR for the new v4 version as well. it can be found here #1113

[jorenbroekema]

Since v3 is essentially in maintenance mode now that v4 is coming soon, I'd prefer to only merge high prio bugfixes/security vulnerabilities, is it okay to only do this fix to the v4 branch?

[tkgroot]

TL;DR: I would appreciate if this bugfix would make it into the current version.

tbh, I find that a bit weird to put v3 in maintenance mode before v4 is actually released. Do not understand the reasoning behind. I will not upgrade my current setup to a running beta because v4 is coming soon (especially because I dislike the term "coming soon").
My current setup does require that bugfix and I'm, like I said, not keen to adapt a beta version.

[jorenbroekema]

Understandable, the main reason is that I'm carrying this solo at the moment and I've got limited time. Since v4 is a complete refactor (ESM, browser-compatible, first-class type safety, and the list goes on), it's getting pretty tough to backport every non-crucial thing to v3. I also don't have CI/CD set up for v3 and thus require @dbanksdesign to manually publish v3, while the v4 prereleases I can publish through github actions myself.

I get your point though about being forced into an unstable API beta version. since this PR is small I'll try to get it released for v3

[tkgroot]

Oh my, I didn't know that this was such a hassle. appreciate the effort you put in to get this released. 💯