Add --report CLI option

[mohit-sheth]

Type of change

• Refactor
• New feature
• Bug fix
• Optimization
• Documentation Update

Description

• Adds a new --report CLI option that supports two modes:
  • Standalone mode (--report file1.json,file2.json): reads pre-existing orion JSON output files and generates a consolidated regression report without running any analysis
  • Integrated mode (--report as a flag): appends a summary report after normal orion analysis
  • Introduces orion/report.py module with functions to parse orion JSON output, extract changepoints with regressed metrics, and render a formatted report with per-workload pass/regression/skip status, metric tables, and PR relevance sorting

Prow PR: Add deferred Orion summary report step for consolidated regression reporting openshift/release#75575

[openshift-ci]

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