Github integration: Single repo access

Arthur:

* Was not able to find my repo as the Sentry integration was only allowed to access a single repo
* I set this up ages ago and there was no hint in the UI that this could be the reason I do not see other repos

Ogi:

* Connect with git providers takes me to [settings]() where row github is not clickable, i have to click on the title. Annoying
* I click on add installation, takes me to github, i already have the sentry app so i allow access to this one repo.
* Sentry settings page says "not installed" even after a refresh
* Uninstalling sentry app from github completely and installing it again worked

Let's first check with folks in #discuss-integrations.

We want to define a set of [lightweight metrics]() that SDKs can automatically collect for e.g. framework, language or platform, focusing only on signals that **do NOT overlap with Tracing**. Ideally these metrics should give a quick sense of app or runtime health, … while deeper investigation will still rely on traces or profiles.

Examples**:**

* Node.js runtime metrics (e.g., event loop delay, heap usage)
* Prisma-related metrics in Next.js
* Mobile CPU / memory usage to help surface potential ANRs or app hangs

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**Candidate Metrics (add more below)**

* …

*(please also add ideas, questions or examples in comments)*