ref(boto3): Use rpc as the default span op

[pabloDeputter]

Description

boto3 spans now use sentry.op = rpc instead of http.client. Service extensions can (and will in the future) provide a more specific op with get_span_op(), e.g. db for DynamoDB.

(todo: add to migration guide?)

Why

• boto3 span represents an AWS api call, not an HTTP request; the HTTP request is already captured as the as the http.client child
• JS already also defaults AWS SDK spans to rpc

It also lets these spans use new name and description rules in sentry-conventions, e.g. (getsentry/sentry-conventions#714, #717), e.g. Lambda.Invoke billing instead of POST https://lambda.…

[github-actions]

Coverage Results 📊

✅ 56199 passed | ⏭️ 2872 skipped | Total: 59071 | Pass Rate: 95.14% | Execution Time: 152m 41s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -81871
Passed Tests	📉 -77467
Failed Tests	—
Skipped Tests	📉 -4404

All tests are passing successfully.

✅ Patch coverage is 100.00% (2 of 2 changed executable lines covered; target 80%).
Project statement coverage is 90.04% (down 0.22 percentage points from base (d22300b) to head (72498a1)).

Changed files with executable lines (2)

File	Patch coverage	Changed executable lines
sentry_sdk/consts.py	100.00%	1/1 covered
sentry_sdk/integrations/boto3/_instrumentation.py	100.00%	1/1 covered

Coverage diff

@@            Coverage Diff             @@
##        master     #8035       +/-##
==========================================
- Coverage    90.26%    90.04%    -0.22%
==========================================
  Files          202       193        -9
  Tracked lines     26660     20939     -5721
  Branches      9926      7208     -2718
==========================================
- Hits         24063     18853     -5210
+ Misses        2597      2086      -511
+ Partials      1510      1234      -276

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