fix(webpack + vite): fix dependency watching in loader

[timofei-iatsenko]

Description

Fixing a bug introduced in #1654
Closes: #1661

Vite's addWatchFile does not have a file existance check as webpack has, so i have to add check it manually before.

Also, we need an e2e tests for /example projects. Because this kind of things really hard to test from build side.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 17, 2023 0:15am

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	1.43 KB (0%)
./packages/detect-locale/dist/index.mjs	721 B (0%)
./packages/react/dist/index.mjs	1.59 KB (0%)
./packages/remote-loader/dist/index.mjs	7.24 KB (0%)

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: +0.08 🎉

Comparison is base (f3824e6) 75.48% compared to head (c63b567) 75.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1662      +/-   ##
==========================================
+ Coverage   75.48%   75.56%   +0.08%     
==========================================
  Files          79       79              
  Lines        2011     2018       +7     
  Branches      518      519       +1     
==========================================
+ Hits         1518     1525       +7     
  Misses        379      379              
  Partials      114      114              

Impacted Files	Coverage Δ
packages/vite-plugin/src/index.ts	0.00% <0.00%> (ø)
...es/cli/src/api/catalog/getCatalogDependentFiles.ts	100.00% <100.00%> (ø)
packages/loader/src/webpackLoader.ts	90.90% <100.00%> (ø)

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