fix: the name of the span events in record_exception should be exception [backport 3.1]

[github-actions]

Backport 4c97677 from #12505 to 3.1.

To be consistent with OpenTelemetry semantics (which are the ones on which ET aligns), the span events created from a record_exception call should be called 'exception'

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: backport-12505-to-3.1
Commit report: 605b01a
Test service: dd-trace-py

✅ 0 Failed, 43 Passed, 460 Skipped, 53.93s Total duration (9m 50.24s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-26 16:00:00

Comparing candidate commit 605b01a in PR branch backport-12505-to-3.1 with baseline commit cf224f4 in branch 3.1.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 416 metrics, 2 unstable metrics.

scenario:iast_aspects-ospathbasename_aspect

• 🟩 execution_time [-432.855ns; -381.863ns] or [-11.765%; -10.379%]

scenario:iast_aspects-ospathsplitext_aspect

• 🟩 execution_time [-414.140ns; -359.818ns] or [-10.423%; -9.055%]