lit [infra] Lit core pre-releases to test #3156

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Pre-releases of Lit core libraries for testing https://github.com/lit/lit/pull/3156.

NOTE: I don't intend to merge this PR; instead I will do the release manually from my workstation after approval. If there are additional pre-releases to do for this feature, I'll push them to this PR and do another round of review. After the feature is merged (or abandoned), I'll close this PR.

Since https://github.com/lit/lit/pull/3156 is a fairly major new feature (adding node builds), which would be a breaking change if we were to remove, I'd like to first publish pre-releases to allow some folks to play around with it.

I think this is the first time we've done pre-releases using changesets. I used https://github.com/changesets/changesets/blob/main/docs/prereleases.md as a reference, and did the following:

npx changeset pre enter next
npx changeset version --ignore @lit-labs/cli --ignore @lit-internal/benchmarks --ignore @lit-labs/context --ignore @lit-labs/motion --ignore @lit-labs/observers --ignore @lit-labs/react --ignore @lit/localize --ignore @lit/localize-tools --ignore @lit/ts-transformers --ignore @lit-internal/localize-examples-runtime-js --ignore @lit-internal/localize-examples-runtime-ts --ignore @lit-internal/localize-examples-transform-js --ignore @lit-internal/localize-examples-transform-ts --ignore @lit-internal/test-element-a --ignore @lit-labs/router --ignore @lit-labs/testing --ignore @lit-labs/virtualizer --ignore @lit-labs/ssr --ignore @lit-labs/ssr-client --ignore @lit-labs/scoped-registry-mixin --ignore @lit-labs/router --ignore @lit-labs/ssr-client --ignore @lit-labs/eleventy-plugin-lit --ignore @lit/lit-starter-js --ignore @lit-labs/task --ignore @lit/lit-starter-ts

The big list of --ignore flags is to prevent publishing packages that depend on these pre-releases, because I don't think we need to do that.