feat(ember): v2

[aklkv]

Before submitting a pull request, please take a look at our
Contributing guidelines and verify:

• If you've added code that should be tested, please add tests.
• Ensure your code lints and the test suite passes (yarn lint) & (yarn test).
• Link an issue if there is one related to your pull request. If no issue is linked, one will be auto-generated and linked.

Summary

Migrates @sentry/ember from the legacy v1 addon format to the Ember v2 addon format. This modernizes the package to work with both classic Ember builds and Embroider-optimized builds, and removes the runtime dependency on @embroider/macros.

Changes

• Build system: Replaced ember-cli build pipeline with rollup (transpilation → dist/) + tsc (declarations → declarations/)
• Addon entry: Added addon-main.cjs using @embroider/addon-shim as the addon entry point
• Package.json: Set ember-addon.version: 2, updated exports map, added ember-addon.app-js mapping
• Config format: Replaced @embroider/macros getOwnConfig() with explicit Sentry.init() calls and a new setupPerformance() export

API changes:

• init() is now called directly in app.ts or an initializer (no more ENV['@sentry/ember'] config)
• setupPerformance() must be called from an instance-initializer to opt into performance instrumentation
• Initial load instrumentation requires manual <script> tags in index.html
• Added UPGRADE.md with detailed migration guide

Test & CI updates:

• All 21 unit tests passing (acceptance tests for errors, performance, and replay)
• Updated e2e test apps (ember-classic, ember-embroider) to use v2 patterns:
  • Added instance-initializers for performance setup
  • Migrated config from ENV['@sentry/ember'] to Sentry.init() in app.ts
  • Added initial load <script> tags to index.html
• Updated .github/workflows/build.yml CACHED_BUILD_PATHS from packages/ember/*.d.ts to packages/ember/dist + packages/ember/declarations

TypeScript fixes:

• Added "types": ["ember-source/types"] to tsconfig.publish.json for Ember module resolution during declaration generation
• Fixed transition type imports (removed non-existent @ember/routing/-private/transition)
• Simplified instrumentFunction generic to avoid tuple mismatch errors

Breaking Changes

• ENV['@sentry/ember'] config in config/environment.js is no longer supported — use Sentry.init() directly
• Performance instrumentation is no longer automatic — call setupPerformance() from an instance-initializer
• Initial load tracking requires manual <script> tags in app/index.html

Closes #15835