Fixture for Multiple Matches

[UdeshyaDhungana]

• Did not include failure fixtures since we're re-using OrderedLinesAssertion

Note

Adds multiple-match (-o) test coverage and fixtures, updates stage inputs, and improves the grep wrapper to translate -E to -P robustly.

• Tests:
  • Update internal/grep/grep_test.go to support -o via onlyMatches flag and build grep args accordingly.
  • Add stdin tests for -o with single, multiple single-line, and multi-line matches.
  • Add multiple_matches_pass case in internal/stages_test.go for stages cj0, ss2, bo4.
  • Tweak internal/stage_multiple_matches_multiple_lines.go to include inputs with multiple phrase matches.
• Fixtures:
  • Add internal/test_helpers/fixtures/multiple_matches/success expected output.
• Scripts:
  • Replace sh with bash and translate -E to -P in-place in internal/test_helpers/pass_all/your_grep.sh; pass rebuilt args to ggrep/find_grep_linux.sh.

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