fix(tracing): Don't use querySelector when not available

[lforst]

Fixes#4098

[lforst]

We really need to find a safer type definition for getGlobalObject...

[Lms24]

Good catch!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.32 KB (-4.06% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	59.9 KB (-7.3% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.18 KB (-3.63% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	53.58 KB (-7.57% 🔽)
@sentry/browser - Webpack (gzipped + minified)	19.87 KB (-14.49% 🔽)
@sentry/browser - Webpack (minified)	63.03 KB (-22.87% 🔽)
@sentry/react - Webpack (gzipped + minified)	19.89 KB (-14.53% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	43.72 KB (-9.03% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.34 KB (-2.81% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	23.9 KB (-2.4% 🔽)