ref(nitro): Inherit base Vitest config for vendored @sentry/conventions

[mydea]

Summary

packages/nitro/vite.config.ts redefined test wholesale, so it did not inherit the base config's server.deps.inline rule. Since nitro's tests load the @sentry/node / @sentry/opentelemetry builds (which vendor @sentry/conventions as ESM .js), Vitest would externalize and require() that ESM copy — which fails on Node 18 (no require(esm) support).

This spreads ...baseConfig.test so nitro inherits the inline rule, alongside the same shared infra changes as the other @sentry/conventions PRs:

• vite/vite.config.ts — inline @sentry/conventions in Vitest.
• packages/typescript/tsconfig.json — map the @sentry/conventions/attributes subpath for node moduleResolution type builds.

Part of splitting the larger @sentry/conventions migration into per-package PRs.

Ref: #20982

🤖 Generated with Claude Code

[mydea]

Superseded by the foundational build-infra fix #21503, which relocates vendored deps out of node_modules at the rollup level. With that fix, the vendored @sentry/conventions no longer lands under a node_modules dir, so Vitest no longer externalizes/require()s it and nitro needs no test-config change. Closing as unnecessary.