ref(build): Remove all comments in generated output

[lforst]

This PR is based on #5783 and the contained discussion.

Quoted from that PR:

The existing regex, when presented with code like this:

/* 
 * This is
 * a multiline
 * comment 
 */

const thisIs = "real code"

/* 
 * This is
 * another multiline
 * comment 
 */

const thisIsAlso = "real code"

matches everything between the initial /* on the first line and the final */ on the second-to-last line, and the plugin thus removes all but the last line of the file. This fixes the regex so that only the comments are removed.

---

In order to avoid similar bugs, and since comment-removal is not as simple as applying a regex, we should outsource comment deletion to a dedicated library - in this case rollup-plugin-cleanup. I decided to remove all comments instead of only multi-line ones because the upside of only having certain ones is unclear to me.

Important comments like tree-shaking hints or source map comments are still intact.

[AbhiPrasad]

we should change all of these to be hard pins - we can do it in another PR

[lforst]

Can do!

[AbhiPrasad]

I'm in favour of this change, since I think we should be indiscriminately removing all comments - it's easier to understand and debug + we don't have to worry about maintaining regex.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.43 KB (-0.22% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	60.08 KB (-0.14% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.06 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	53.01 KB (-0.13% 🔽)
@sentry/browser - Webpack (gzipped + minified)	19.82 KB (-0.2% 🔽)
@sentry/browser - Webpack (minified)	64.37 KB (-0.18% 🔽)
@sentry/react - Webpack (gzipped + minified)	19.84 KB (-0.2% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	44.74 KB (+0.07% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.88 KB (-0.13% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.31 KB (+0.02% 🔺)

[lobsterkatie]

Discussed offline and we're going to go ahead with a modified version of this, which doesn't remove comments.