Unable to login to UI when automatic upgrades is misconfigured

[nklaassen]

Expected behavior:
I should always be able to log in to the web UI, even if some non-critical feature like automatic upgrades is misconfigured

Current behavior:
I see only local login options (not able to log in with passwordless or SSO):

and errors in the browser console:

GET https://nic-test.cloud.gravitational.io/web/config.js net::ERR_ABORTED 500 (Internal Server Error)
login:1 Refused to execute script from 'https://nic-test.cloud.gravitational.io/web/config.js' because its MIME type ('application/json') is not executable, and strict MIME type checking is enabled.

I believe this happens because getWebConfig returns early here after encountering an error fetching the target version for automatic upgrades. The upgrade base URL is currently configured as https://updates.releases.teleport.dev/v1/stable/cloud/v15 which is not set up for v15 yet.

Bug details:

• Teleport version: v15.0.0-alpha.5
• Recreation steps
• Debug logs