refactor: update opencollection extension for bruno

[naman-bruno]

Description

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Summary by CodeRabbit

• Refactor
  • Reorganized internal extension configuration structure for improved maintainability and consistency in collection file handling.

[coderabbitai]

Walkthrough

This PR restructures OpenCollection's extension schema by nesting ignore and presets configuration under a bruno sub-extension. The parsing and stringification logic is updated to read from and write to oc.extensions.bruno instead of the top-level extensions object.

Changes

Cohort / File(s)	Summary
OpenCollection Fixture packages/bruno-cli/tests/runner/fixtures/opencollection/collection/opencollection.yml	Moved ignore list from extensions.ignore to nested extensions.bruno.ignore structure.
YAML Parser packages/bruno-filestore/src/formats/yml/parseCollection.ts	Updated to read ignore and presets from oc.extensions.bruno instead of top-level extensions, centralizing access via brunoExtension variable.
YAML Stringifier packages/bruno-filestore/src/formats/yml/stringifyCollection.ts	Restructured to write ignore and presets under oc.extensions.bruno with nested structure for presets (presets.request); added hasBrunoExtensions gate to control bruno block output.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• add: export info & remove unused component #6547: Implements the same restructuring of moving ignore/presets into extensions.bruno across parsing/stringifying and converters.
• add support for additional context roots in opencollection #6995: Modifies the same YAML collection parsing/stringifying paths to access extensions.bruno for additional configuration.
• add: oc support for cli #6661: Touches OpenCollection parsing/fixtures and extension handling structure.

Suggested reviewers

• bijin-bruno
• lohit-bruno
• helloanoop

Poem

🏗️ Extensions find their place,
Nested snug in bruno's space,
Parse and stringify align,
Config structures now refine! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: restructuring how ignore and presets are nested within the OpenCollection extensions from top-level to bruno sub-extension.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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