chore(rpc): Remove querying EAP via snql

[wmak]

• the useRpc Param used with dataset=spans allows the frontend to choose between querying via rpc or snql
• this should be a no-op since even if the frontend wasn't passing useRpc and hitting eap via snql should work via rpc

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
330	1	329	11

View the top 1 failed test(s) by shortest run time

::tests.sentry.integrations.slack.test_unfurl

Stack Traces | 0s run time

#x1B[31mImportError while importing test module '.../integrations/slack/test_unfurl.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
#x1B[1m#x1B[.../hostedtoolcache/Python/3.13.1.../x64/lib/python3.13/importlib/__init__.py#x1B[0m:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
#x1B[1m#x1B[.../integrations/slack/test_unfurl.py#x1B[0m:18: in <module>
    from sentry.snuba import discover, errors, spans_eap, transactions
#x1B[1m#x1B[31mE   ImportError: cannot import name 'spans_eap' from 'sentry.snuba' (.../sentry/snuba/__init__.py)#x1B[0m#x1B[0m

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