Allow controller tests to be executed in parallel

[jeroenrinzema]

No description provided.

[Copilot]

Pull request overview

This PR enables parallel execution of controller tests in the Nexus service by adding t.Parallel() to all test functions and increasing the PostgreSQL max_connections limit to accommodate concurrent database access.

• Adds t.Parallel() to all controller test functions across multiple test files
• Increases PostgreSQL container max_connections from default 100 to 500 to support parallel test execution
• Adds explanatory comments about the max_connections increase

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
services/nexus/internal/http/controllers/v1/users_test.go	Added parallel execution for 14 user controller tests
services/nexus/internal/http/controllers/v1/templates_test.go	Added parallel execution for 4 template controller tests
services/nexus/internal/http/controllers/v1/tags_test.go	Added parallel execution for 5 tag controller tests
services/nexus/internal/http/controllers/v1/projects_test.go	Added parallel execution for 4 project controller tests
services/nexus/internal/http/controllers/v1/organizations_test.go	Added parallel execution for 4 organization controller tests
services/nexus/internal/http/controllers/v1/locales_test.go	Added parallel execution for 5 locale controller tests
services/nexus/internal/http/controllers/v1/lists_test.go	Added parallel execution for 7 list controller tests
services/nexus/internal/http/controllers/v1/journeys_test.go	Added parallel execution for 5 journey controller tests
services/nexus/internal/http/controllers/v1/documents_test.go	Added parallel execution for 5 document controller tests
services/nexus/internal/http/controllers/v1/campaigns_test.go	Added parallel execution for 7 campaign controller tests
services/nexus/internal/http/controllers/v1/admins_test.go	Added parallel execution for 7 admin controller tests
pkg/container/postgres.go	Increased max_connections to 500 with explanatory comment