chore: remove dead code SchemaValidator

[patlo-iog]

Description:

Summarize the changes you're submitting in a few sentences, including Jira ticket ATL-xxxx if applicable.
Link to any discussion, related issues and bug reports to give the context to help the reviewer understand the PR.

Alternatives Considered (optional):

Link to existing ADR (Architecture Decision Record), if any. If relevant, describe other approaches explored and the selected approach. Documenting why the methods were not selected will create a knowledge base for future reference, helping prevent others from revisiting less optimal ideas.

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Integration Test Results

20 files  ±0  20 suites  ±0   2s ⏱️ ±0s
45 tests ±0  45 ✅ ±0  0 💤 ±0  0 ❌ ±0 
71 runs  ±0  71 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit ce58865. ± Comparison against base commit a7d51b6.

[github-actions]

Unit Test Results

 96 files  + 54   96 suites  +54   23m 16s ⏱️ + 21m 32s
826 tests +511  818 ✅ +511  8 💤 ±0  0 ❌ ±0 
833 runs  +518  825 ✅ +518  8 💤 ±0  0 ❌ ±0 

Results for commit ce58865. ± Comparison against base commit a7d51b6.

[yshyn-iohk]

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