fix: Restrict officially supported browserlist

[AkshatJawne]

Closes #1752

** The only thing I am not 100% sure about is how we can test this before merging **

I tried experimenting with checking the compatible browsers on their own website: https://browsersl.ist/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.67%. Comparing base (8b20692) to head (c89eab8).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2159      +/-   ##
==========================================
- Coverage   46.68%   46.67%   -0.02%     
==========================================
  Files         691      692       +1     
  Lines       38588    38620      +32     
  Branches     9622     9809     +187     
==========================================
+ Hits        18016    18025       +9     
+ Misses      20561    20542      -19     
- Partials       11       53      +42     

Flag	Coverage Δ
unit	46.67% <ø> (-0.02%)	⬇️

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[mofojed]

Take a look at this comment you removed (about how this is just for post-css...). We need to wire up Vite to use .browserslistrc in place of build.target using the browserslist-to-esbuild module it looks like: vitejs/vite#11489

Otherwise this .browserslistrc is only going to be used for CSS, and not used when building JS.

A blog post about Vite and browserslist may be information as well: https://dev.to/meduzen/when-vite-ignores-your-browserslist-configuration-3hoe

We should also be able to compare the package size before/after and see the impact (check the size of the code-studio/build folder after doing an npm run build before and after).

[AkshatJawne]

@mofojed Size Comparison of code-studio/build:

Before changes: 56.4 MB
After changes: 56.9 MB

[mofojed]

Update the web-client-ui README with the browsers we support/link to this file: https://github.com/deephaven/web-client-ui?tab=readme-ov-file#browser-support
@dsmmcken was there any other testing you wanted to be done for this?

[dsmmcken]

No, I had no specific testing requirements. Which browser doesn't support top level await?

[AkshatJawne]

@dsmmcken This link outlines which versions of which browsers can use top level await https://caniuse.com/mdn-javascript_operators_await_top_level , it seems that with our new restrictions, the browsers and versions that we have outlined should support top level await