fix(core): Fix OIDC configuration update path

[afitzek]

Summary

This fixes a caching problem in the OIDC module. The cache was not cleared when new settings were provided, also it was not checked correctly when accessing the cache if the settings changed. This also improves setting the OIDC settings, by validating the discovery endpoint and fetching the data from it.

Related Linear tickets, Github issues, and Community forum posts

closes https://linear.app/n8n/issue/PAY-3735/improve-oidc-configuration-updates

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[bundlemon]

BundleMon

Unchanged files (2)

Status	Path	Size	Limits
✅	WASM Dependencies tree-sitter-bash.wasm	181.26KB	-
✅	WASM Dependencies tree-sitter.wasm	74.47KB	-

No change in files bundle size

Groups updated (2)

Status	Path	Size	Limits
✅	**/*.js	5.73MB (+370.33KB +6.73%)	-
✅	**/*.css	195.45KB (+4.2KB +2.19%)	-

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[codecov]

Codecov Report

❌ Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...kages/frontend/editor-ui/src/views/SettingsSso.vue	81.25%	3 Missing ⚠️

📢 Thoughts on this report? Let us know!

[cubic-dev-ai]

No issues found across 4 files