feat(cursor-agent): add toggle for whether to create pr

[jennmueng]

We'll default PR creation to false because there's a lot of noise

1. We add a new field auto_create_pr to the seer preferences handoff configuration.
2. We get it from the project preferences when calling a coding agent
3. We pass it into the launch call

Seer PR https://github.com/getsentry/seer/pull/4078
Frontend PR #103730

[codecov]

❌ 5 Tests Failed:

Tests completed	Failed	Passed	Skipped
30021	5	30016	240

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

tests.sentry.integrations.api.endpoints.test_organization_coding_agents.OrganizationCodingAgentsPostInstructionTest::test_launch_with_empty_instruction

Stack Traces | 8.74s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_coding_agents.py#x1B[0m:1403: in test_launch_with_empty_instruction
    response = self.get_success_response(self.organization.slug, method="post", **data)
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:628: in get_success_response
    assert_status_code(response, 200, 300)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:47: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 300#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

tests.sentry.integrations.api.endpoints.test_organization_coding_agents.OrganizationCodingAgentsPostInstructionTest::test_launch_with_max_length_instruction

Stack Traces | 8.89s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_coding_agents.py#x1B[0m:1448: in test_launch_with_max_length_instruction
    response = self.get_success_response(self.organization.slug, method="post", **data)
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:628: in get_success_response
    assert_status_code(response, 200, 300)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:47: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 300#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

tests.sentry.integrations.api.endpoints.test_organization_coding_agents.OrganizationCodingAgentsPostInstructionTest::test_launch_with_custom_instruction

Stack Traces | 8.9s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_coding_agents.py#x1B[0m:1315: in test_launch_with_custom_instruction
    response = self.get_success_response(self.organization.slug, method="post", **data)
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:628: in get_success_response
    assert_status_code(response, 200, 300)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:47: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 300#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

tests.sentry.integrations.api.endpoints.test_organization_coding_agents.OrganizationCodingAgentsPostInstructionTest::test_launch_with_instruction_and_root_cause_trigger

Stack Traces | 9.05s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_coding_agents.py#x1B[0m:1525: in test_launch_with_instruction_and_root_cause_trigger
    response = self.get_success_response(self.organization.slug, method="post", **data)
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:628: in get_success_response
    assert_status_code(response, 200, 300)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:47: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 300#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

tests.sentry.integrations.api.endpoints.test_organization_coding_agents.OrganizationCodingAgentsPostInstructionTest::test_launch_with_blank_instruction

Stack Traces | 9.87s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_coding_agents.py#x1B[0m:1361: in test_launch_with_blank_instruction
    response = self.get_success_response(self.organization.slug, method="post", **data)
#x1B[1m#x1B[.../sentry/testutils/cases.py#x1B[0m:628: in get_success_response
    assert_status_code(response, 200, 300)
#x1B[1m#x1B[.../sentry/testutils/asserts.py#x1B[0m:47: in assert_status_code
    assert minimum <= response.status_code < maximum, (
#x1B[1m#x1B[31mE   AssertionError: (500, b'{"detail":"Internal Error","errorId":null}')#x1B[0m
#x1B[1m#x1B[31mE   assert 500 < 300#x1B[0m
#x1B[1m#x1B[31mE    +  where 500 = <Response status_code=500, "application/json">.status_code#x1B[0m

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