Update dependency @sentry/browser to v8

What does this MR do and why?

Sentry major version had some breaking changes so renovate bot (!153530 (closed)) couldn't handle the upgrade. We have to do it ourselves.

Some references:

• Sentry v8 migration guide
• Deprecations in v7
• Sentry configuration options
• Configuration integrations
• Set Up Performance

Why some many differences?

Sentry defines a good list of default integrations.

In v7 we needed a lot of customization to add non-default integrations such as BrowserTracing (to test browser performance). In v8, Sentry Browser adds made the default integrations opt-out, so we can use a simpler setup to have them.

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