[SF PROFILER] Use fetch instead of Sfjs.request and minor style adjusments to better match the new profiler layout

[n3o77]

Not sure exactly when it happened but in Symfony 6.4.1 the Sfjs class is not available in the profiler so i replaced Sfjs.request with fetch.

I wanted to change as little as possible so the requests match the old functionality and no controller changes are necessary.

Also included some minor styling adjustments to match the new profiler design and support dark-mode. Mainly avoiding the buttons to break in multiple lines and changing the font color in the textarea in dark-mode. Let me know if you would prefer a separate PR for those.

Before:

After:

Any feedback is welcome.

[bocharsky-bw]

Looks good to me 👍

I'm not sure why it was written with Sfjs initially, probably for better compatibility with browsers, but all latest ones should support fetch with no problem: https://caniuse.com/?search=fetch

So I wonder about others opinions

[rvanlaak]

A global browser usage of 97.48% for fetch is fine by me, especially given that it's mostly engineers that use the profile and likely won't fall under that remaining several %.

[bocharsky-bw]

Makes sense :)

OK, thank you for your work on it!