fix: use (name, subtype) tuple as deduplication key in add_deprecated_components

[Rama542]

Closes #523

What this fixes

The add_deprecated_components method in InventoryManager was checking for duplicates using only the component name. That works fine when every component name is unique, but it breaks down as soon as two components share the same name under different subtypes.

Here is a concrete example. The Collector has extensions under both extension/encoding and extension/storage. If a component called zipkin existed under both, and the encoding variant was removed first and recorded as deprecated, then when the storage variant was removed later, the code would find zipkin already in existing_names and skip the second entry entirely. The storage deprecation would be permanently lost from the registry with no warning.

The fix

Changed the deduplication set from a flat set of names to a set of (name, subtype) tuples. This is exactly the same approach used to fix DeprecationDetector._build_component_set in PR 498 and issue 493. The detection side was already corrected there, and this PR corrects the persistence side so correctly detected removals are not dropped before they reach the registry.

Before:

existing_names = {comp["name"] for comp in deprecations[distribution][component_type]}

if component["name"] not in existing_names:

After:

existing_keys = {
    (comp["name"], comp.get("subtype"))
    for comp in deprecations[distribution][component_type]
}

if (component["name"], component.get("subtype")) not in existing_keys:

Tests

Added two new test cases in test_inventory.py:

test_add_deprecated_components_same_name_different_subtype
Verifies that when zipkin (encoding) is already in the index and zipkin (storage) is newly deprecated, both entries end up in the index.

test_add_deprecated_components_no_duplicate_same_name_and_subtype
Verifies that an entry with the exact same name and the exact same subtype is still correctly skipped, so the existing deduplication behavior is preserved.

All 145 tests in the collector-watcher suite pass.

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[jaydeluca]

is this a duplicate of #498 ?