Expand precommit hook support

[rudolphjacksonm]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like

• pre-commit-hooks: trailing whitespace, EOF newline, YAML/JSON/TOML checks, merge conflict markers, large files
  • terraform fmt for *.tf, validate with -backend=false
  • terraform security checks via checkov or similar
  • eslint/prettier for ui/app, using the existing scripts in ui/app/package.json:66
  • Markdown linting, since .markdownlint.json already exists
  • shellcheck for changed shell scripts

Describe alternatives you've considered
N/A
Additional context
Add any other context or screenshots about the feature request here.

[ChrisChapman-gh]

I'd throw in terraform fmt, terrafmt, tflint, terraform-docs and if you're feeing brave - avmfix (from the AVM modules) with a tweaked config file

[marrobi]

Bandit is one we should maybe add. Would they be enabled in the devcontainer?