Deprecate SECRET_DETECTION_COMMIT_* options

Description

Gitleaks v8.0.0 removed all --commit* options and instead offered a more flexible --log-opts option which accepts git log options.

Commit related options

Variable	Reason for deprecation
SECRET_DETECTION_COMMIT_FROM	Can be replaced by SECRET_DETECTION_LOG_OPTS
SECRET_DETECTION_COMMIT_TO	Can be replaced by SECRET_DETECTION_LOG_OPTS
SECRET_DETECTION_COMMITS	Can be replaced by SECRET_DETECTION_LOG_OPTS
SECRET_DETECTION_COMMITS_FILE	Can be replaced by SECRET_DETECTION_LOG_OPTS

These deprecations would reduce the complexity in the analyzer as we are parsing a commits file and generating git log options from that commits file.

Other options that should be deprecated

Variable	Reason for deprecation
SECRET_DETECTION_ENTROPY_LEVEL	Entropy only rules are not supported by gitleaks. They caused too many false positives

Tasks

• Update documentation
• Remove variables
• Detect if these variables are provided and print a warning