[*] Fix: size-limit report for esm modules

[etrepum]

Description

For some reason the default configuration of size-limit for @lexical/plain-text caused nearly the whole module to be tree shaken, so nothing of interest was measured. This makes sure to test the full size of every package we are measuring.

Closes #6233

Test plan

Before

size-limit would report a 225 bytes for @lexical/plain-text esm

  @lexical/plain-text - esm
  Size:         225 B with all dependencies, minified and brotlied
  Loading time: 10 ms on slow 3G

After

size-limit should report a meaningful number for @lexical/plain-text esm

  @lexical/plain-text - esm
  Size:         24.44 kB with all dependencies, minified and brotlied
  Loading time: 478 ms   on slow 3G

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2024 11:08pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2024 11:08pm

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	23.97 KB (0%)
lexical - esm	23.96 KB (0%)
@lexical/rich-text - cjs	34.69 KB (0%)
@lexical/rich-text - esm	23.95 KB (0%)
@lexical/plain-text - cjs	34.63 KB (0%)
@lexical/plain-text - esm	225 B (0%)
@lexical/react - cjs	149.29 KB (0%)
@lexical/react - esm	82.64 KB (0%)

[etrepum]

The github action for size-limit does some wonky stuff to base it from main for comparison, but I did confirm that it is doing the right thing locally. You can see this in other size-limit related PRs such as #6219 and #6209 and see that their PR comments are not based on the incoming config.