feat!: bump build.target and name it baseline-widely-available

[sapphi-red]

Description

Introduces baseline-widely-available target alias and use that by default. The modules target alias that was the default is now removed.

This PR includes the following changes:

• remove modules target alias
  • This was an alias of ['es2020', 'edge88', 'firefox78', 'chrome87', 'safari14'].
  • This was not the list of browsers that supports ESM, and was confusing
• add baseline-widely-available target alias
  • This is a list of browsers compatible with Baseline Widely Available feature sets.
  • The list of browsers will be re-generated on each major version of Vite.
    • For Vite 7, I generated the list for 2025-05-01. The generated list is ['chrome107', 'edge107', 'firefox104', 'safari16'].
    • I added a script to generate the list at packages/vite/scripts/generateTarget.ts and can be ran by pnpm run generate-target.
• make baseline-widely-available to be the default value of build.target
• update tsconfig.json in templates to use "target": "ES2022" and "lib": ["ES2022", ...]
  • The new default target supports all ES2022 features except for Safari 16.0-16.4 not supporting class static blocks. The exception can be ignored because static blocks would be transformed by esbuild.

close #19358

[patak-dev]

looks great! I thought we could name it just baseline, but I see that would be confusing. The explicit name is correct and people won't be typing it anyways

[vegerot]

lgtm! Coincidentally I suggested the same thing yesterday for Rspack web-infra-dev/rspack#10290