Add "auth0_clients" data source for listing multiple clients with filtering

[devin-brenton]

🔧 Changes

This PR adds a new data source auth0_clients that allows retrieving a list of clients from Auth0 with optional filtering capabilities. This complements the existing auth0_client data source which only returns a single client.

Key features:

• New data source: auth0_clients
• Optional filters:
  • name_filter: Filter clients by name (partial matches supported)
  • app_types: Filter by application types
  • is_first_party: Filter for first-party clients
• Returns a list of clients with a subset of fields from the single client data source
• Supports pagination to retrieve all matching clients
• HTTP recordings for acceptance tests are included

Implementation notes:

• Reuses the schema from auth0_client data source but removes fields that aren't commonly needed in list operations
• Removed fields include:
  • client_aliases
  • logo_uri
  • oidc_conformant
  • oidc_backchannel_logout_urls
  • organization_usage
  • organization_require_behavior
  • cross_origin_auth
  • cross_origin_loc
  • custom_login_page_on
  • custom_login_page
  • form_template
  • require_pushed_authorization_requests
  • mobile
  • initiate_login_uri
  • native_social_login
  • refresh_token
  • signing_keys
  • encryption_key
  • sso
  • sso_disabled
  • jwt_configuration
  • addons
  • default_organization
  • compliance_level
  • require_proof_of_possession
• This paring down of fields makes the list response more manageable and focused on the most commonly needed client properties

Example usage:

# Get all SPA clients
data "auth0_clients" "spa_clients" {
  app_types = ["spa"]
}

# Get first-party clients with specific name pattern
data "auth0_clients" "filtered_clients" {
  name_filter = "api-"
  is_first_party = true
}

🔬 Testing

1. Acceptance tests have been added covering:
   • Filtering by name
   • Filtering by application type
   • Filtering by first-party status
   • Invalid filter validation
   • All tests include HTTP recordings

To run the tests:

# Run all client list tests
make test-acc FILTER="TestAccDataClients"

# Record new HTTP interactions if needed
make test-acc-record FILTER="TestAccDataClients"

📝 Checklist

• New functionality is covered by acceptance tests
• Documentation has been added for the new data source
• HTTP recordings have been added and sensitive data redacted
• Schema follows existing patterns from auth0_client data source
• Error handling follows provider patterns
• Code formatting and structure match existing provider code

Additional Notes:

• The implementation reuses schemas and patterns from the existing client data source
• HTTP recordings have been properly sanitized to remove sensitive information
• The data source uses standard Auth0 API pagination to handle large result sets
• Filter validation ensures proper input values

[brianhyder]

This fixes #784

[duedares-rvj]

@devin-brenton Thank you so much for this PR. This is great!
Could you please add something under examples/data-sources/auth0_clients and then run make docs?

That should be all of this PR. :)

[acwest]

There are a couple of minor linting issues (make lint will fix most of them, and tell you about the ones it doesn't fix), and there is a test failure where TestAccDataClientsIsFirstPartyFilter results in a dirty plan.
In general, we have been putting similar data_sources into the same directory and package as the one-to-one version, so that the two can re-use common code, but it isn't always necessary. I am just looking over the code more in-depth now, so hopefully will have something more useful to say soon :-)

[acwest]

@devin-brenton what do you think of moving this to the client directory? An example of how we usually do it is in organization. The files would probably be named data_source_clients.go and data_source_clients_test.go. The docs and examples would be fine where they are...

[devin-brenton]

@devin-brenton what do you think of moving this to the client directory? An example of how we usually do it is in organization. The files would probably be named data_source_clients.go and data_source_clients_test.go. The docs and examples would be fine where they are...

I like that idea. Could help clean things up a bit by keeping it all in one package.

[devin-brenton]

@acwest I've moved the files into the client package and tests look good on my end. I'm having trouble understanding why the test is failing in the pipeline. I'm running the acc tests against a test tenant I spun up.