fix(table-core): guard process.env.NODE_ENV checks for bundler-less environments

[koreahghg]

🎯 Changes

Fixes #6078.

table-core's ~14 dev-only debug/validation checks read process.env.NODE_ENV directly. That raw read survives unguarded into the published ESM build (unbundle: true, no define in tsdown.config.ts), so any environment with no process global — vanilla JS loaded via an import map, or any other bundler-less/non-Node setup — throws ReferenceError: process is not defined the moment one of these checks runs (e.g. simply constructing a table with debugTable: true).

Added a single isDevelopmentEnv() helper in utils.ts that checks typeof process !== 'undefined' before reading process.env.NODE_ENV, and routed all 14 call sites through it. Behavior is otherwise unchanged — still === 'development', not flipped to !== 'production' (that was the debated part of the related draft PR #6445, which is why it's stuck; this PR intentionally only fixes the crash and leaves that semantic question alone).

Verified the fix actually reaches the published artifact: after building, the only process.env reference left in dist/utils.js is the guarded one inside isDevelopmentEnv().

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr (ran the equivalent steps directly: vitest run for @tanstack/table-core — 1275/1275 passing, including new regression tests — plus tsc --noEmit, eslint, and a tsdown build; the full nx affected pipeline timed out locally on an unrelated test:sherif/test:knip pass over the whole workspace).

🚀 Release Impact

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

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