ref(utils): Use array constant for console levels

[lobsterkatie]

Currently, the array ['log', 'info', 'warn', 'error', 'debug', 'assert'] appears three times in our code, and because it's an array of strings, it's can't be minified. This PR uses a constant in its place, for a small bundle size win.

Ref: https://getsentry.atlassian.net/browse/WEB-697

[github-actions]

size-limit report

Path	Base Size (af7081c)	Current Size	Change
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.37 KB	19.37 KB	-0.01% 🔽
@sentry/browser - ES5 CDN Bundle (minified)	61.92 KB	61.88 KB	-0.06% 🔽
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.04 KB	18.04 KB	+0.01% 🔺
@sentry/browser - ES6 CDN Bundle (minified)	55.32 KB	55.29 KB	-0.06% 🔽
@sentry/browser - Webpack (gzipped + minified)	22.3 KB	22.3 KB	+0.03% 🔺
@sentry/browser - Webpack (minified)	76.58 KB	76.55 KB	-0.04% 🔽
@sentry/react - Webpack (gzipped + minified)	22.33 KB	22.33 KB	+0.03% 🔺
@sentry/nextjs Client - Webpack (gzipped + minified)	46.56 KB	46.54 KB	-0.04% 🔽
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.25 KB	25.25 KB	0%
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	23.65 KB	23.66 KB	+0.02% 🔺

[AbhiPrasad]

Good change!

The reason it has weird results with gzip is because of compression algo preferring repetition, but this is cleaner.

[Lms24]

Good change!