text: Title: [BUG] Ignoring nested schema examples
  Body: ### Checklist
  
  - [x] I checked the [FAQ section](https://schemathesis.readthedocs.io/en/stable/faq.html#frequently-asked-questions) of the documentation
  - [x] I looked for similar issues in the [issue tracker](https://github.com/schemathesis/schemathesis/issues)
  - [x] I am using the latest version of Schemathesis
  
  ### Describe the bug
  
  When trying out examples in swagger 2.0 i see that the example values of nested objects are not considered
  
  ### To Reproduce
  
  🚨 **Mandatory** 🚨: Steps to reproduce the behavior:
  
  1. Run this command `st run -v --hypothesis-phases=explicit --validate-schema=true -c all -H "Authorization: Bearer root" --generation-allow-x00=False --hypothesis-verbosity=debug --base-url=http://localhost:8083 tree-openapi202.json --show-trace --dry-run`
  2. See error
  
  Please include a minimal API schema causing this issue:
  minimal api schema attached (see Additional context section)
  
  ### Expected behavior
  lets say we have a hypothetical tree object with related birds that live on the tree
  ```
  tree:
      name: birch
      height: 25m
      bird: 
         name: bird1
         description: example-bird
  ```
  Assume name fields are mandatory in tree, bird
  Expect to see these examples.
  1. `{ tree { name: birch }}` Minimal example with only required fields of only tree
  2. `{ tree: { name: birch, bird: { name: bird1 }}` Minimum example with only required fields of tree, bird
  3. `{ tree: { name: birch, height: 25m, bird: { name: bird1, description: example-bird }}` Maximum example with all fields populated
  
  examples 2, 3 are missing in schemathesis
  schemathesis never generates any example of bird under the tree whether or not we declare name fields as mandatory
  note: dredd behavior is only example 3, greedy approach
  
  ### Environment
  
  `platform Linux -- Python 3.9.18, schemathesis-3.33.0, hypothesis-6.103.5, hypothesis_jsonschema-0.23.1, jsonschema-4.22.0
  `
  
  ### Additional context
  this is the sample swagger doc used for testing
  [tree-openapi20.json](https://github.com/user-attachments/files/16315777/tree-openapi20.json)
  
  