feat(identity): multiple active secrets

[juliamrch]

Description

• Test this API workflow

closes #4475

Preview Links

https://deploy-preview-6338--kongdeveloper.netlify.app/identity/auth-servers/#kong-identity-client-credential-authentication-flow

Testing instructions

To quickly test this, go to the Konnect Docs DEV org > Identity > Authorization servers and click any server. Then:

• Create a new client
• Copy the client ID and the Client secret
• Copy this command to test the connection, and run it after replacing the values:

curl -s -X POST "<auth)server-issuer-url>/auth/oauth/token" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "grant_type=client_credentials" \
  -d "client_id=client-id" \
  -d "client_secret=<client-secret>"

• Create a new secret:

❯ curl -X POST "https://us.api.konghq.tech/v1/auth-servers/<auth-server-id>/clients/<client-id>/secrets" \
     --no-progress-meter --fail-with-body  \
     -H "Authorization: Bearer $KONNECT_TOKEN" \
     --json '{
       "secret": "'new-secret'",
       "enabled": true
     }'

Try to connect with both the first and the second secrets, to check that both are active.

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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