fix(secrets): multiline matches show the secret and not the first line

[RabeaZr]

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Below is a concise technical summary of the changes proposed in this PR:

Improve the CustomRegexDetector to correctly display multiline secrets by introducing a new function find_line_number to accurately determine the line number of secrets. Enhance test coverage with a new test case TestMultilineFinding to validate the changes.

Topic	Details
Multiline Secret Fix	Fix the multiline secret detection in CustomRegexDetector by quoting the secret and accurately finding its line number using find_line_number. Modified files (1) checkov/secrets/plugins/custom_regex_detector.py Latest Contributors(2) User Commit Date omryMen fix-secrets-skip-empty... November 18, 2024 RabeaZr fix-secrets-add-prerun... November 17, 2024
Test Enhancement	Add a new test case TestMultilineFinding to ensure multiline secret detection works correctly, using a sample Dockerfile for testing. Modified files (2) tests/secrets/test_multiline_finding_line_number.py tests/secrets/multiline_finding/Dockerfile.mine Latest Contributors(0) User Commit Date

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[omryMen]

can you add a test and an example result please