[feat] Add patch totals to the /pulls endpoint

[rohitvinnakota-codecov]

Purpose/Motivation

Addressing https://github.com/codecov/internal-issues/issues/1144

The diff field is deprecated due to its flaky responses so we are going to add a patch field for changes in the patch coverage of a pull request

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Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.99%. Comparing base (e4924ba) to head (3f59af1).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

[codecov-public-qa]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
2719	1	2718	6

View the top 1 failed tests by shortest run time

api/public/v2/tests/test_api_pull_viewset.py::PullViewsetTests::test_retrieve_with_patch_coverage_no_commit_comparison

Stack Traces | 0.13s run time

self = <test_api_pull_viewset.PullViewsetTests testMethod=test_retrieve_with_patch_coverage_no_commit_comparison>
mock_cc_filter = <MagicMock name='filter' id='140151107159488'>
mock_comparison_report = <MagicMock name='ComparisonReport' id='140151112000928'>

    @patch("api.public.v2.pull.serializers.ComparisonReport")
    @patch("services.comparison.CommitComparison.objects.filter")
    def test_retrieve_with_patch_coverage_no_commit_comparison(
        self, mock_cc_filter, mock_comparison_report
    ):
        mock_cc_instance = MagicMock(is_processed=False)
        mock_cc_filter.return_value.select_related.return_value.first.return_value = (
            mock_cc_instance
        )
    
        mock_file = MagicMock()
        mock_file.patch_coverage.hits = 0
        mock_file.patch_coverage.misses = 0
        mock_file.patch_coverage.partials = 0
        mock_comparison_report.return_value.impacted_files = [mock_file]
    
        res = self.client.get(
            reverse(
                "api-v2-pulls-detail",
                kwargs={
                    "service": self.org.service,
                    "owner_username": self.org.username,
                    "repo_name": self.repo.name,
                    "pullid": self.pulls[0].pullid,
                },
            )
        )
        assert res.status_code == 200
        data = res.json()
>       assert data["patch"] == self.no_patch_response
E       AssertionError: assert None == {'coverage': 0.0, 'hits': 0, 'misses': 0, 'partials': 0}
E        +  where {'coverage': 0.0, 'hits': 0, 'misses': 0, 'partials': 0} = <test_api_pull_viewset.PullViewsetTests testMethod=test_retrieve_with_patch_coverage_no_commit_comparison>.no_patch_response

.../v2/tests/test_api_pull_viewset.py:418: AssertionError

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✅ All tests successful. No failed tests were found.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.08%. Comparing base (e4924ba) to head (3f59af1).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1108   +/-   ##
=======================================
  Coverage   96.07%   96.08%           
=======================================
  Files         837      837           
  Lines       19657    19687   +30     
=======================================
+ Hits        18886    18916   +30     
  Misses        771      771           

Flag	Coverage Δ
unit	95.99% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	95.99% <100.00%> (+<0.01%)	⬆️

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[JerrySentry]

lgtm, just missing a test for the uncovered line :P