Drop metrics

[sentrivana]

Just to reiterate, Sentry will stop accepting metrics on Oct 7. The next major of the SDK will take at least some weeks longer.

We have two options re: metrics:

1. We leave the sentry_sdk.metrics APIs, but make them no-op
2. We remove everything.

This PR does 2. I believe this is ok because:

• We've deprecated metrics and are now emitting a warning about dropping them in the next major
• They're in beta, so not generally available
• We will call this out properly both in the detailed changelog as well as in the migration guide in the docs

[codecov]

❌ 3422 Tests Failed:

Tests completed	Failed	Passed	Skipped
16606	3422	13184	1434

View the top 3 failed tests by shortest run time

tests.integrations.celery.test_celery test_producer_span_data[redis]

Stack Traces | 0s run time

No failure message available

tests.integrations.clickhouse_driver.test_clickhouse_driver test_clickhouse_dbapi_spans_with_pii

Stack Traces | 0s run time

No failure message available

tests.integrations.httpx.test_httpx test_option_trace_propagation_targets[httpx_client14-trace_propagation_targets14-https://example.com-True]

Stack Traces | 0s run time

No failure message available

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[antonpirker]

Rest in Peace, metrics.