ci: skip flaky gunicorn, botocore and freezegun tests (#13662)

Recent Failures on main:
- Freezegun:
https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-py/-/jobs/980088085
- gunicorn:
https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-py/-/jobs/977203066
- botocore:
https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-py/-/jobs/980093469


## Checklist
- [x] 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](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] 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](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
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](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

---------

Co-authored-by: Emmett Butler <[email protected]>
Co-authored-by: William Conti <[email protected]>

Author: 3 people

tests/contrib/botocore/test.py

@@ -1226,6 +1226,7 @@ def test_schematized_unspecified_service_sqs_client_v1(self):
         assert spans[2].name == "aws.sqs.receive"
 
     @mock_stepfunctions
+    @pytest.mark.xfail(reason="Failed to start or connect to state machine")
     def test_stepfunctions_send_start_execution_trace_injection(self):
         sf = self.session.create_client("stepfunctions", region_name="us-west-2", endpoint_url="http://localhost:4566")
         sf.create_state_machine(
@@ -1249,6 +1250,7 @@ def test_stepfunctions_send_start_execution_trace_injection(self):
         sf.delete_state_machine(stateMachineArn="arn:aws:states:us-west-2:000000000000:stateMachine:lincoln")
 
     @mock_stepfunctions
+    @pytest.mark.xfail(reason="Failed to start or connect to state machine")
     def test_stepfunctions_send_start_execution_trace_injection_with_array_input(self):
         sf = self.session.create_client("stepfunctions", region_name="us-west-2", endpoint_url="http://localhost:4566")
         sf.create_state_machine(
@@ -1270,6 +1272,7 @@ def test_stepfunctions_send_start_execution_trace_injection_with_array_input(sel
         sf.delete_state_machine(stateMachineArn="arn:aws:states:us-west-2:000000000000:stateMachine:miller")
 
     @mock_stepfunctions
+    @pytest.mark.xfail(reason="Failed to start or connect to state machine")
     def test_stepfunctions_send_start_execution_trace_injection_with_true_input(self):
         sf = self.session.create_client("stepfunctions", region_name="us-west-2", endpoint_url="http://localhost:4566")
         sf.create_state_machine(

tests/contrib/freezegun/test_freezegun.py

@@ -7,6 +7,7 @@
 from ddtrace.internal.utils.time import StopWatch
 from ddtrace.trace import tracer as dd_tracer
 from tests.contrib.pytest.test_pytest import PytestTestCaseBase
+from tests.utils import flaky
 
 
 class TestFreezegunTestCase:
@@ -71,6 +72,7 @@ def test_freezegun_configure_default_ignore_list_continues_to_ignore_ddtrace(sel
 
 
 class PytestFreezegunTestCase(PytestTestCaseBase):
+    @flaky(1759346444)
     def test_freezegun_pytest_plugin(self):
         """Tests that pytest's patching of freezegun in the v1 plugin version works"""
         import sys

tests/contrib/gunicorn/test_gunicorn.py

@@ -11,6 +11,7 @@
 import pytest
 
 from ddtrace.internal.utils.retry import RetryError  # noqa:F401
+from tests.utils import flaky
 from tests.utils import snapshot_context
 from tests.webclient import Client
 
@@ -165,6 +166,7 @@ def gunicorn_server(gunicorn_server_settings, tmp_path):
 )
 
 
+@flaky(1759346444, reason="Server startup is flaky in CI. It is unclear whether the server fails to start or shutdown.")
 @pytest.mark.skipif(sys.version_info >= (3, 11), reason="Gunicorn is only supported up to 3.10")
 def test_no_known_errors_occur(tmp_path):
     for gunicorn_server_settings in [