Update Secret Detection .gitleaks.toml to include keywords and updated regexes

Proposal

We should take advantage of some of the new configuration features in the latest version of gitleaks, namely leveraging rule keywords.

If a rule has a keywords present then gitleaks will perform a string compare operation to determine if a region of code likely contains a secret for the current rule. This speeds up gitleaks scans significantly.

Tasks

• Update the Secret Detection analyzer's gitleaks.toml file to include keywords