Upgrade TypeScript compiler to 7.0.2

[ConnorQi01]

Summary

Upgrade the build compiler to TypeScript 7.0.2 while keeping TypeScript 6.0.2 available exclusively for tooling that still depends on the legacy compiler JavaScript API.

Changes

• Use the official TypeScript 6 compatibility package as the root typescript dependency for ESLint and legacy tooling.
• Add typescript-7 as an npm alias to TypeScript 7.0.2 and invoke its CLI for project compilation.
• Update the gulp and webpack compilation paths for the TS7 CLI.
• Replace gulp-preprocess with line-preserving preprocessing so conditional compilation does not shift generated JavaScript source positions.
• Remove unused or incompatible build dependencies, including @typescript/native-preview, gulp-typescript, ts-loader, ts-node, gulp-preprocess, and gulp-sourcemaps.
• Keep ESLint enabled through the compatible TypeScript 6 API.
• Resolve CommonJS import compatibility exposed by TypeScript 7 without launching a real browser in tests.
• Remove the stale reactNative.publishToExpHost registered-command expectation; the command is absent from both source and the extension manifest.
• Merge the latest master, including current dependency security fixes.

Validation

• npm ci passed.
• npm run build passed with 0 errors and 158 existing warnings.
• npx gulp webpack-bundle passed.
• npm test passed: 318 tests, 0 failures, 1 skipped. The commandsRegistered and stubbed browser-launch tests pass.
• npx gulp passed.
• npm run smoke-build passed; the VSIX contains 106 files and is 4.79 MB.
• Source-map verification maps generated rn-extension.js:56 back to rn-extension.ts:13.
• Process snapshots before and after validation showed no newly retained Node, ADB, VS Code, or Extension Host processes.
• Pre-commit Prettier and ESLint checks passed.

Closes #2764

[EmmaYuan1015]

/azp run

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).
1 pipeline(s) were filtered out due to trigger conditions.

[ConnorQi01]

/azp run

[azure-pipelines]

Azure Pipelines:
Successfully started running 1 pipeline(s).
1 pipeline(s) were filtered out due to trigger conditions.