Rename `sentrybrowser7` to `@sentry/browser` for easier autoupgrade

What does this MR do and why?

Renovate is unable to pick up the sentry upgrades as it's looking for the @sentry/browser package and we've renamed/aliased them to sentrybrowser5 and sentrybrowser7.

We could update renovate to look for these with this line:

matchPackagePatterns: ["@sentry/browser", "sentrybrowser5", "sentrybrowser7"]

However, it may be better to rename sentrybrowser7 back to @sentry/browser and keep it up to date with the latest version. If that's not possible, we could consider a non-numbered alias so we can continue to upgrade sentry beyond version 7 without confusion.

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