feat: Dynamic credentials authorization endpoint for oauth2

[BGZStephen]

Summary

Related Linear tickets, Github issues, and Community forum posts

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)

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
15529	1	15528	0

View the top 1 failed test(s) by shortest run time

OauthService generateAOauth2AuthUri should skip userId in CSRF state when skipAuthOnOAuthCallback is true

Stack Traces | 0.002s run time

Error: expect(jest.fn()).toHaveBeenCalledWith(...expected)

Expected: ObjectContaining {"cid": "1"}
Received: "user-id"

Number of calls: 1
    at Object.<anonymous> (.../oauth/__tests__/oauth.service.test.ts:1037:36)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)

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[blacksmith-sh]

Found 1 test failure on Blacksmith runners:

Failure

Test	View Logs
OauthService/ OauthService generateAOauth2AuthUri should skip userId in CSRF state when skipAuthOnOAu thCallback is true	View Logs

[currents-bot]

✅

E2E Tests: n8n tests passed after 10m 5.4s

🟢 576 · 🔴 0 · ⚪️ 43 · 🟣 1

View Run Details

Run Details

• Project: n8n

• Groups: 2

• Framework: Playwright

• Run Status: Passed

• Commit: d92ad82

• Spec files: 129

• Overall tests: 619

• Duration: 10m 5.4s

• Parallelization: 9

Groups

GroupId	Results	Spec Files Progress
multi-main:ui	🟢 519 · 🔴 0 · ⚪️ 43 · 🟣 1	120 / 120
multi-main:ui:isolated	🟢 57 · 🔴 0 · ⚪️ 0	9 / 9

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