Improve Landing Page When `Require SSO` is Checked in Auth Settings for SSO

### Problem Statement

When `Require SSO` is unchecked in the Auth Settings, users are able to login via SSO or via username/password. The problem it is not obvious how to do so.

When visiting an org with SSO enabled, you are always presented with a page with a single button that says `Login with `. It is the same for Require SSO. It is not obvious that you are able to sign in with username and password only at our main login page: [www.sentry.io/auth/login]()

### Solution Brainstorm

When `Require SSO` is unchecked, visiting an org directly should provide a way to login via username and password.

When visiting an org directly, could we adopt the main login page at [www.sentry.io/auth/login]() and replace the `Login with ` button with it? The main login page already allows for both username and password plus SSO sign in.

### Product Area

Sign In

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)*