tests: reduce nested type/UDT depth to 12 for new CQL nesting limit

[sylwiaszunejko]

Scylla now caps the nesting depth of CQL expressions in the parser, rejecting deeply nested literals with: SyntaxException code=2000 'expression nested too deeply'

Cap the deepest case at 12, the maximum depth the server now allows.

Caused by scylladb/scylladb@c27e322.

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• I added relevant tests for new features and bug fixes.
• All commits compile, pass static checks and pass test.
• PR description sums up the changes and reasons why they should be introduced.
• I have provided docstrings for the public items that I want to introduce.
• I have adjusted the documentation in ./docs/source/.
• I added appropriate Fixes: annotations to PR description.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 0db95ec5-ab9c-4589-b524-cefbf574c4d8

📥 Commits

Reviewing files that changed from the base of the PR and between c08913b and 995642d.

📒 Files selected for processing (2)

• tests/integration/standard/test_types.py
• tests/integration/standard/test_udts.py

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📝 Walkthrough

Walkthrough

This PR adjusts test constants for nested type coverage to align with Scylla's CQL expression nesting depth limit of 12. The nested tuple test changes its maximum depth from 32 to 12 (updating schema columns and iteration range) and adds a comment documenting the constraint. Three nested UDT tests similarly reduce their maximum nesting depth parameters from 16 to 12.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: reducing nested type/UDT test depth to 12 due to a new CQL nesting limit.
Description check	✅ Passed	The PR description explains the motivation (Scylla's new nesting depth limit), the action taken (capping tests at depth 12), and references the upstream change; however, the pre-review checklist shows gaps in test additions and documentation.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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