Add environment file parameter to exe

What does this MR do and why?

This adds the --environment-issues-output-file parameter that was never added to the executable in the gem, only in the RelateFailureIssue class to accept the parameter. It was missed in local testing by calling the command with the file directly as shown below.

This was found by errors such as

https://ops.gitlab.net/gitlab-org/quality/production/-/jobs/20827484#L448

invalid option: --environment-issues-output-file (OptionParser::InvalidOption) 	from /builds/gitlab-org/quality/production/.gems/gems/gitlab_quality-test_tooling-2.23.0/exe/relate-failure-issue:11:in `new' 	from /builds/gitlab-org/quality/production/.gems/gems/gitlab_quality-test_tooling-2.23.0/exe/relate-failure-issue:11:in `<top (required)>' 	from /builds/gitlab-org/quality/production/.gems/bin/relate-failure-issue:25:in `load' 	from /builds/gitlab-org/quality/production/.gems/bin/relate-failure-issue:25:in `<main>'

Relates to gitlab-org/quality/quality-engineering/team-tasks#3885 (closed)

How to set up and validate locally

From past MR !340 (merged):

Test environment issue detection:

bundle exec relate-failure-issue --group-similar \ --input-files './spec/gitlab_quality/test_tooling/report/fixtures/rspec-reports/group-failures/job1/rspec-*.json' \ --project "gitlab-org/quality/e2e-test-issues" \ --token "<YOUR_TOKEN>" \ --dry-run

Expected output:

• Logs showing "Identified as environment error"
• "Found 1 groups after filtering"
• Creates /tmp/environment_issues.json with grouped failure data

Test Slack notification:

bundle exec post-to-slack 
--environment-issues-file /tmp/environment_issues.json 
--slack-webhook-url "$CI_SLACK_WEBHOOK_URL" 
--channel "#your-test-channel" 
--username "GitLab QA Bot" 
--icon-emoji ""

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