fix: replace experimentalDts with dts to fix TS2883 with nodenext module resolution

[lokesh-7977]

🎯 Changes

Replace experimentalDts: true with dts: true in all tsup configs to fix
TS2883 errors when using module: "nodenext" with declaration emit.

experimentalDts generates a shared _tsup-dts-rollup.cjs file that TypeScript
cannot reference portably from .d.cts re-exports under nodenext resolution.
Switching to dts generates per-entry declaration files, eliminating the
problematic internal path.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

• Build Improvements
  • Updated package builds to use the standard TypeScript declaration generation setting.
  • Ensured modern and legacy builds continue producing type declaration files consistently.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request replaces experimentalDts: true with dts: true in Angular, ESLint plugin, Preact devtools, and shared modern/legacy tsup configurations.

Changes

tsup declaration configuration

Layer / File(s)	Summary
Replace experimental declaration option packages/angular-query-persist-client/tsup.config.ts, packages/eslint-plugin-query/root.tsup.config.js, packages/preact-query-devtools/root.tsup.config.js, scripts/getTsupConfig.js	All affected package-specific and generated modern/legacy tsup configurations use dts: true instead of experimentalDts: true.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change and its nodenext/TS2883 motivation.
Description check	✅ Passed	The description matches the template with Changes, Checklist, and Release Impact sections filled in.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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