ref(resolvers): remove the TraceItemDataResolver abstraction

[MeredithAnya]

Stack

1. ref(resolvers): remove unused resolver declarations #8451 ref(resolvers): remove unused resolver declarations
2. ref(resolvers): inline the trace item stats resolver #8452 ref(resolvers): inline the trace item stats resolver
3. ref(resolvers): inline the time series resolver #8453 ref(resolvers): inline the time series resolver
4. ref(resolvers): inline the trace item table resolver #8454 ref(resolvers): inline the trace item table resolver
5. → #this ref(resolvers): remove the TraceItemDataResolver abstraction

What

No endpoint dispatches through a resolver anymore, so this deletes:

• TraceItemDataResolver and RPCEndpoint.get_resolver in snuba/web/rpc/__init__.py
• the whole snuba/web/rpc/v1/resolvers/ package, including the _TO_IMPORT directory scan that populated the registry as an import side effect

Re-homing the non-resolvers

resolvers/ also held modules that were never resolvers and are imported by already-converted endpoints (endpoint_trace_item_attribute_names.py, trace_item_attribute_values.py, endpoint_get_traces.py), so they move somewhere that describes them — following eefb13118:

From	To
resolvers/common/{aggregation,trace_item_table,cross_item_queries,formula_reliability}.py	snuba/web/rpc/common/
resolvers/R_eap_items/heatmap_builder.py	snuba/web/rpc/v1/
resolvers/R_eap_items/co_occurring_attrs/	snuba/web/rpc/v1/
tests/web/rpc/v1/resolvers/.../co_occurring_attrs/	tests/web/rpc/v1/co_occurring_attrs/

All git mv, so they should show as renames.

Verification

• pytest tests/web/rpc/ → 826 passed, 2 skipped, 2 xfailed
• mypy snuba/ → clean across 816 files
• grep -rn 'resolver' snuba/web/rpc/ returns only the unrelated snuba/query/allocation_policies/resolver.py import

Worth a second look: deleting the _TO_IMPORT scan removes an import side effect. The passing suite dispatches these endpoints by name over HTTP, which covers registration, but I couldn't run a standalone import smoke check — a bare python -c 'from snuba.web.rpc import RPCEndpoint' fails with AttributeError: METRICS_COUNTERS on master too, so that's a pre-existing settings-profile thing rather than something introduced here.

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