feat(core/core-sse): migrate to #platform/* imports

[deyaaeldeen]

Migrate @azure/core-sse to #platform/* conditional imports:

• #platform/types — platform-specific types for IncomingMessage, NodeJSReadableStream, and stream cancellation
• Extracted browser/RN type stubs into types-browser.mts and types-react-native.mts
• Per-platform tsconfigs under config/, updated eslint/vitest/warp configs

[Copilot]

Pull request overview

This PR migrates @azure/core-sse to use #platform/* conditional imports so that Node-only types and stream cancellation logic can be expressed in a platform-safe way across Node, browser, and React Native builds.

Changes:

• Introduces #platform/types with per-platform implementations (types.ts, types-browser.mts, types-react-native.mts) and updates SSE utilities to consume it.
• Splits build/test TypeScript configuration into per-platform config/ tsconfigs and updates warp/vitest/eslint to match.
• Updates the public API reports to reflect the platform-specific typing differences (e.g., NodeIncomingMessage/NodeJSReadableStream as never outside Node).

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/core/core-sse/warp.config.yml	Switches to an explicit multi-target warp config pointing at per-platform tsconfigs.
sdk/core/core-sse/vitest.browser.config.ts	Re-exports the shared browser vitest config from eng/vitestconfigs.
sdk/core/core-sse/tsconfig.test.node.json	Deletes old root-level test tsconfig (moved under config/).
sdk/core/core-sse/tsconfig.test.json	Deletes old root-level composite test references (now in tsconfig.json + config/).
sdk/core/core-sse/tsconfig.src.json	Deletes old root-level src tsconfig (replaced by per-platform ones).
sdk/core/core-sse/tsconfig.snippets.json	Deletes old root-level snippets tsconfig (moved under config/).
sdk/core/core-sse/tsconfig.samples.json	Deletes old root-level samples tsconfig (moved under config/).
sdk/core/core-sse/tsconfig.json	Updates project references to new per-platform tsconfigs under config/.
sdk/core/core-sse/tsconfig.browser.config.json	Deletes old browser config tsconfig (replaced by config/tsconfig.test.browser.json).
sdk/core/core-sse/src/utils.ts	Switches Node stream typing/cancellation to #platform/types and factors cancel logic into cancelNodeStream.
sdk/core/core-sse/src/types.ts	Adds Node implementation of NodeIncomingMessage, NodeJSReadableStream, and cancelNodeStream.
sdk/core/core-sse/src/types-react-native.mts	Adds RN stubs for missing DOM types + defines Node types as never and a no-op canceller.
sdk/core/core-sse/src/types-browser.mts	Adds browser stubs defining Node types as never and a no-op canceller.
sdk/core/core-sse/src/sse.ts	Replaces IncomingMessage with NodeIncomingMessage from #platform/types and inlines PartialSome.
sdk/core/core-sse/src/models.ts	Re-exports platform-specific NodeIncomingMessage/NodeJSReadableStream types from #platform/types.
sdk/core/core-sse/src/index.ts	Exports NodeIncomingMessage publicly alongside existing types.
sdk/core/core-sse/review/core-sse-react-native.api.diff.md	Adds RN API diff showing Node-only types become never.
sdk/core/core-sse/review/core-sse-node.api.md	Updates Node API report to use/export NodeIncomingMessage.
sdk/core/core-sse/review/core-sse-browser.api.diff.md	Adds browser API diff showing Node-only types become never.
sdk/core/core-sse/package.json	Adds imports mapping for #platform/types and updates scripts to use new config/ tsconfigs.
sdk/core/core-sse/eslint.config.mjs	Adopts config-array style and points ESLint parser at config/tsconfig.lint.json.
sdk/core/core-sse/config/tsconfig.test.react-native.json	New RN test tsconfig extending eng/tsconfigs/test.react-native.json.
sdk/core/core-sse/config/tsconfig.test.browser.json	New browser test tsconfig extending eng/tsconfigs/test.browser.json.
sdk/core/core-sse/config/tsconfig.src.react-native.json	New RN src tsconfig extending eng/tsconfigs/src.react-native.json.
sdk/core/core-sse/config/tsconfig.src.browser.json	New browser src tsconfig extending eng/tsconfigs/src.browser.json.