Add the most_recent_report_date_for_issue method

Context

Closes #84 (closed):

Have a method that, given a test health issue, would return the most recent report, with timestamp, for each kind of health check (slowness, flakiness, ...).

This method could then be used in triage-ops to be able to know which issue didn't receive a report in a certain amount of time.

What does this MR do and why?

Adds the most_recent_report_date_for_issue method to FlakyTestIssue, SlowTestIssue and FailedTestIssue.

The first two are comment-based, and the FailedTestIssue is discussion-based. The logic handles both cases.

How to set up and validate locally

# Checkout this branch

bin/console

failed_test_issue = GitlabQuality::TestTooling::Report::FailedTestIssue.new(token: ENV['GITLAB_API_PRIVATE_TOKEN'], project: 'gitlab-org/gitlab')
flaky_test_issue  = GitlabQuality::TestTooling::Report::FlakyTestIssue.new(token: ENV['GITLAB_API_PRIVATE_TOKEN'], project: 'gitlab-org/gitlab')
slow_test_issue   = GitlabQuality::TestTooling::Report::SlowTestIssue.new(token: ENV['GITLAB_API_PRIVATE_TOKEN'], project: 'gitlab-org/gitlab')

failed_test_issue_id = 473313 # https://gitlab.com/gitlab-org/gitlab/-/issues/473313
flaky_test_issue_id  = 444722 # https://gitlab.com/gitlab-org/gitlab/-/issues/444722
slow_test_issue_id   = 479841 # https://gitlab.com/gitlab-org/gitlab/-/issues/479841

failed_test_issue.most_recent_report_date_for_issue(issue_iid: failed_test_issue_id)
=> "2024-07-19"
failed_test_issue.most_recent_report_date_for_issue(issue_iid: flaky_test_issue_id)
=> nil
failed_test_issue.most_recent_report_date_for_issue(issue_iid: slow_test_issue_id)
=> nil

flaky_test_issue.most_recent_report_date_for_issue(issue_iid: failed_test_issue_id)
=> nil
flaky_test_issue.most_recent_report_date_for_issue(issue_iid: flaky_test_issue_id)
=> "2024-05-14"
flaky_test_issue.most_recent_report_date_for_issue(issue_iid: slow_test_issue_id)
=> nil

slow_test_issue.most_recent_report_date_for_issue(issue_iid: failed_test_issue_id)
=> nil
slow_test_issue.most_recent_report_date_for_issue(issue_iid: flaky_test_issue_id)
=> nil
slow_test_issue.most_recent_report_date_for_issue(issue_iid: slow_test_issue_id)
=> "2024-08-19"

MR acceptance checklist

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