http2: refactor and split tests of http2.js into multiple files

[Uzlopak]

@metcoder95

Please checkout the change in `onHttp2SessionGoAway`

Also do bun test ./test/http2-dispatcher.js

Just proposing changes of the tests, as the changes of client-h2.js will be proposed in another PR.

[Copilot]

Pull Request Overview

This PR reorganizes HTTP/2 test files by splitting the large test/http2.js file into smaller, focused test files grouped by functionality. The changes also include minor JSDoc improvements and refactoring in the HTTP/2 client implementation.

• Split the monolithic test/http2.js file into 13 separate test files organized by feature area
• Added JSDoc type annotations to the HTTP/2 client implementation
• Minor refactoring to improve code consistency and readability

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/http2.js	Removed entire file content (1887 lines deleted)
test/http2-trailers.js	New file containing HTTP/2 trailers handling test
test/http2-timeout.js	New file containing HTTP/2 stream timeout test
test/http2-stream.js	New file containing HTTP/2 stream error handling test
test/http2-pseudo-headers.js	New file containing HTTP/2 pseudo-headers tests
test/http2-instantiation.js	New file containing HTTP/2 client instantiation validation tests
test/http2-goaway.js	New file containing HTTP/2 GOAWAY frame handling tests
test/http2-dispatcher.js	New file containing HTTP/2 dispatcher method tests (stream, pipeline, connect, etc.)
test/http2-continue.js	New file containing HTTP/2 continue handling test
test/http2-connection.js	New file containing basic HTTP/2 connection tests
test/http2-body.js	New file containing HTTP/2 request body handling tests
test/http2-alpn.js	Modified existing file with minor cleanup and added completion awaits
test/http2-agent.js	New file containing HTTP/2 agent tests
test/http2-abort.js	New file containing HTTP/2 request abort tests
lib/dispatcher/client-h2.js	Added JSDoc annotations and minor refactoring improvements

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[mcollina]

lgtm