ref: Remove datetime_from_isoformat

[sentrivana]

Description

The only purpose of this util function was compatibility with Python 3.6.

Issues

Closes #5009

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[codecov]

❌ 12 Tests Failed:

Tests completed	Failed	Passed	Skipped
24213	12	24201	1709

View the top 3 failed test(s) by shortest run time

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.072s run time

tests/test_basics.py:426: in test_breadcrumb_ordering
    for x in event["breadcrumbs"]["values"]
tests/test_basics.py:426: in <listcomp>
    for x in event["breadcrumbs"]["values"]
E   ValueError: Invalid isoformat string: '2025-10-17T16:21:29.000000Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.072s run time

tests/test_basics.py:470: in test_breadcrumb_ordering_different_types
    for x in event["breadcrumbs"]["values"]
tests/test_basics.py:470: in <listcomp>
    for x in event["breadcrumbs"]["values"]
E   ValueError: Invalid isoformat string: '2025-10-19T16:21:29.370377Z'

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.083s run time

tests/test_basics.py:422: in test_breadcrumb_ordering
    timestamps_from_event = [
tests/test_basics.py:423: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-17T16:21:21.000000Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.083s run time

tests/test_basics.py:466: in test_breadcrumb_ordering_different_types
    timestamps_from_event = [
tests/test_basics.py:467: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-19T16:21:22.092921Z'

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.084s run time

tests/test_basics.py:422: in test_breadcrumb_ordering
    timestamps_from_event = [
tests/test_basics.py:423: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-17T16:22:07.000000Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.084s run time

tests/test_basics.py:466: in test_breadcrumb_ordering_different_types
    timestamps_from_event = [
tests/test_basics.py:467: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-19T16:22:07.175650Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.092s run time

tests/test_basics.py:466: in test_breadcrumb_ordering_different_types
    timestamps_from_event = [
tests/test_basics.py:467: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-19T16:22:23.511920Z'

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.094s run time

tests/test_basics.py:422: in test_breadcrumb_ordering
    timestamps_from_event = [
tests/test_basics.py:423: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-17T16:21:22.000000Z'

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.094s run time

tests/test_basics.py:422: in test_breadcrumb_ordering
    timestamps_from_event = [
tests/test_basics.py:423: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-17T16:22:22.000000Z'

tests.test_basics::test_breadcrumb_ordering

Stack Traces | 0.094s run time

tests/test_basics.py:422: in test_breadcrumb_ordering
    timestamps_from_event = [
tests/test_basics.py:423: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-17T16:22:23.000000Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.094s run time

tests/test_basics.py:466: in test_breadcrumb_ordering_different_types
    timestamps_from_event = [
tests/test_basics.py:467: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-19T16:21:22.537286Z'

tests.test_basics::test_breadcrumb_ordering_different_types

Stack Traces | 0.094s run time

tests/test_basics.py:466: in test_breadcrumb_ordering_different_types
    timestamps_from_event = [
tests/test_basics.py:467: in <listcomp>
    datetime.datetime.fromisoformat(x["timestamp"]).astimezone(
E   ValueError: Invalid isoformat string: '2025-10-19T16:22:22.811694Z'

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