Refactoring records + primary constructor instrumentation

[daveMueller]

closes #1576

[Copilot]

Pull Request Overview

This PR refactors record tests and primary constructor instrumentation by moving record-related samples into a dedicated file and simplifying auto-property instrumentation logic.

• Migrate record-related test cases from Instrumentation.AutoProps.cs to a new Instrumentation.Records.cs file.
• Simplify auto-property instrumentation logic in CecilSymbolHelper.cs by removing the constructor check and the related default initialization skip.

Reviewed Changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated no comments.

File	Description
test/coverlet.core.coverage.tests/Samples/Instrumentation.Records.cs	Introduces various record types and tests covering records with primary constructors, inheritance, and abstract records.
test/coverlet.core.coverage.tests/Samples/Instrumentation.AutoProps.cs	Removes duplicate record-related test cases that were relocated.
src/coverlet.core/Symbols/CecilSymbolHelper.cs	Adjusts the auto-property instrumentation logic by removing the constructor check and skipping default initialization handling.

Comments suppressed due to low confidence (2)

src/coverlet.core/Symbols/CecilSymbolHelper.cs:1367

• The removal of the constructor check (methodDefinition.IsConstructor) changes when auto-property instrumentation is applied. Please confirm that applying instrumentation to non-constructor methods does not lead to unexpected behavior.

      if (!skipAutoProps) return false;

test/coverlet.core.coverage.tests/Samples/Instrumentation.Records.cs:5

• [nitpick] Consider adding brief inline comments to clarify the intent and differences between the various record test types to improve code readability and maintainability.

    public record RecordWithPropertyInit