Volume Server: handle incomplete ec encoding (#7384)

* handle incomplete ec encoding

* unit tests

* simplify, and better logs

* Update disk_location_ec.go

When loadEcShards() fails partway through, some EC shards may already be loaded into the l.ecVolumes map in memory. The previous code only cleaned up filesystem files but left orphaned in-memory state, which could cause memory leaks and inconsistent state.

* address comments

* Performance: Avoid Double os.Stat() Call
* Platform Compatibility: Use filepath.Join

* in memory cleanup

* Update disk_location_ec.go

* refactor

* Added Shard Size Validation

* check ec shard sizes

* validate shard size

* calculate expected shard size

* refactoring

* minor

* fix shard directory

* 10GB sparse files can be slow or fail on non-sparse FS. Use 10MB to hit SmallBlockSize math (1MB shards) deterministically.

* grouping logic should be updated to use both collection and volumeId to ensure correctness

* unexpected error

* handle exceptions in tests; use constants

* The check for orphaned shards should be performed for the previous volume before resetting sameVolumeShards for the new volume.

* address comments

* Eliminated Redundant Parsing in checkOrphanedShards

* minor

* Avoid misclassifying local EC as distributed when .dat stat errors occur; also standardize unload-before-remove.

* fmt

* refactor

* refactor

* adjust to warning

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