build(sveltekit): Remove vite types from build output

[Lms24]

In #7438, we added vite.config.ts to our SvelteKit pacakge. We also added it to our sveltekit/tsconfig.json instead of sveltekit/tsconfig.test.json which meant that some types from Vite ended up in our sveltekt/build/types directory.This messed up the directory structure and causing the types entry point to no longer be valid. This PR fixes that by adding the vite config to tsconfig.test.json.

Also, this PR fixes the test:unit yarn script as just executing vitest started vitest in watch mode on local machines (and single-run mode on CI). IMO we shouldn't start it in watch mode by default, as we have test:unit:watch to do that.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.41 KB (+0.01% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	63.3 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.99 KB (+0.01% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	56.21 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.65 KB (0%)
@sentry/browser - Webpack (minified)	67.44 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.68 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	52.12 KB (+0.07% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	33.66 KB (+0.02% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.01 KB (+0.05% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	43.17 KB (0%)
@sentry/replay - Webpack (gzipped + minified)	37.19 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	61.31 KB (+0.02% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.39 KB (+0.01% 🔺)

[AbhiPrasad]

good catch, thanks!