Add test suite to check the data integrity of block cache.

[syeleti-msft]

Type of Change

• Bug fix
• New feature
• Code quality improvement
• Other (describe): Add tests

Description

• Feature / Bug Fix: (Brief description of the feature or issue being addressed)

[Copilot]

Pull Request Overview

This PR adds a comprehensive test suite to verify the data integrity of block cache functionality in Blobfuse2. The test suite includes various file operations and edge cases to ensure the block cache maintains data consistency across different scenarios.

• Tests basic file operations (create, read, write, truncate) with integrity verification
• Tests advanced scenarios like sparse writing, stripe operations, concurrent operations, and file descriptor duplication
• Tests edge cases including O_TRUNC operations, unlink-on-open behavior, and parallel flush calls

Comments suppressed due to low confidence (2)

test/scenarios/blk_cache_integrity_test.go:1003

• Function name has a typo: 'Parlrel' should be 'Parallel' to match the naming pattern of TestParallelFlushCalls.

func TestParllelFlushCallsByDuping(t *testing.T) {

test/scenarios/blk_cache_integrity_test.go:949

• Function name has a typo: 'Parlrel' should be 'Parallel'.

func TestParllelFlushCalls(t *testing.T) {