feat: Use globalThis for code injection

[timfish]

Since v8 of the JavaScript SDKs we dropped Node v12 support which means all the platforms we support have globalThis.

This saves ~90 bytes every time debug IDs are injected.

• SDKs read from globalThis - feat(utils): Use globalThis sentry-javascript#11351
• Next.js SDK injects globalThis - fix(nextjs): Use globalThis for code injection sentry-javascript#13132
• Bundler plugins inject globalThis - feat(core): Use globalThis for code injection sentry-javascript-bundler-plugins#610

@lforst points out that this would require a major version bump of both the CLI and the bundler plugins so these bumps would likely need to occur at the same time and it might not be a priority to merge this straight away!

[JakeShirley]

I just re-implemented this in #2271 before seeing this. I'd love this change, as this would allow us to use Sentry in QuickJS contexts. Without this QuickJS cannot use the debug injection (global, window, and self do not exist in ES2023 which is what QuickJS supports).

[szokeasaurusrex]

#2301 should allow globalThis to be used, and it is backwards compatible, unlike this change. Therefore, I am closing this PR in favor of #2301 for now