Add warning for quoted --log-opts values

[rgmz]

Description:

This is a proposed 'fix' for the bizarre behaviour described in #1153.

$ ./gitleaks detect --log-level debug --log-opts="--full-history --all -- ':(exclude)cypress/**/*' \"foo\"" --source .


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    ░    gitleaks

10:24AM DBG no gitleaks config found in path .gitleaks.toml, using default gitleaks config
10:24AM DBG found .gitleaksignore file
10:24AM WRN the following `--log-opts` values may not work as expected: [':(exclude)cypress/**/*' "foo"]
        see https://github.com/gitleaks/gitleaks/issues/1153 for more information
10:24AM DBG executing: /usr/bin/git -C . log -p -U0 --full-history --all -- ':(exclude)cypress/**/*' "foo"
10:24AM INF 0 commits scanned.
10:24AM DBG Note: this number might be smaller than expected due to commits with no additions
10:24AM INF scan completed in 57.3ms
10:24AM INF no leaks found

Checklist:

• Does your PR pass tests?
• Have you written new tests for your changes?
• Have you lint your code locally prior to submission?

References

This fixes #1153.

[zricethezav]

@rgmz great change, thanks!