chore: Deprecate send_default_pii

[sentrivana]

send_default_pii will be dropped in 3.0 in favor of data_collection.

I'd wait for one or two releases after 2.70 before merging this, but it can already be reviewed.

See also https://docs.sentry.io/platforms/python/data-management/data-collected/

[github-actions]

Codecov Results 📊

✅ 133451 passed | ⏭️ 7276 skipped | Total: 140727 | Pass Rate: 94.83% | Execution Time: 444m 56s

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2566 uncovered lines.
✅ Project coverage is 90.34%. Comparing base (4b9d329) to head (0369cab).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    89.88%    90.34%    +0.46%
==========================================
  Files          193       202        +9
  Lines        24834     26552     +1718
  Branches      8912      9854      +942
==========================================
+ Hits         22321     23986     +1665
- Misses        2513      2566       +53
- Partials      1417      1499       +82

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