Fix GitHubReview state values to match the GitHub API

[Socialpranker]

GitHubReview.state was typed as "APPROVED" | "REQUEST_CHANGES" | "COMMENT" | "PENDING", but the reviews API doesn't send REQUEST_CHANGES or COMMENT. It sends CHANGES_REQUESTED and COMMENTED, which is why the check in #1443 silently never matches:

reviews.find(review => review.state === 'REQUEST_CHANGES')

DISMISSED was missing too, so a dismissed review had no valid type either.

On the shape of the fix: @orta suggested keeping the literal array and adding | string, and checking GitHub's own OpenAPI description makes that the right call rather than just a lenient one. pull-request-review.state there is a plain type: string with CHANGES_REQUESTED as the example, with no enum, so GitHub deliberately doesn't commit to a closed set. A fully exact union would still be wrong even with the names corrected. The literals give you autocomplete, and | string stops the type from claiming a guarantee GitHub doesn't make.

One side effect worth flagging: source/danger-incoming-process-schema.json is generated by typescript-json-schema, and adding | string drops the enum from that property, leaving "type": "string". That's the honest description now, since the old enum listed two values GitHub never sends and would reject the two it does. Nothing validates against that schema at runtime; it's there for other danger-process implementations.

The regenerated danger.d.ts and schema are included. source/dsl/GitHubDSL.ts also picked up two unrelated formatting hunks (author_association indentation and a trailing space) because lint-staged runs prettier over the whole staged file on commit.

Ran the full suite: 682 passing. Note that the tests don't run on Node 25 at all on main, since buffer-equal-constant-time reads SlowBuffer.prototype which Node 25 removed, so 32 suites fail to load before any test executes. On Node 22 everything is green.

Written with Claude Code (Claude Opus 5); I reviewed and tested everything before submitting.

[Socialpranker]

The red test job here isn't from this PR. It fails in the "Make a small babel app" step while installing a fresh create-react-app:

error @testing-library/jest-dom@6.10.0: The engine "node" is incompatible with this module. Expected version ">=22". Got "20.20.2"

.github/workflows/CI.yml pins node-version: "20", and that transitive dependency now requires Node 22, so the step fails before Danger runs. #1524 hits the identical error, so it's independent of what either PR changes. Happy to bump the workflow to Node 22 in a separate PR if that's useful.