Build out enhancements for the LME automated workflows

[mitchelbaker-cisa]

Is your feature request related to a problem? Please describe.

This is an epic to track various enhancements for LME's CI pipeline, new automated workflows, and way we can increase linter coverage.

Describe the solution you'd like

• main.yml can be refactored into more concise workflows (linter specific, semgrep scan, etc.) https://github.com/cisagov/LME/issues/176
• Linting errors https://github.com/cisagov/LME/issues/328
• SBOM workflow https://github.com/cisagov/LME/issues/92
• Add dependabot #409

Additional context

If there's any other enhancements related to LME's automated workflows, then please list them in this issue.