Add language-specific linting and shellcheck to format.sh

[bm1549]

Motivation

#5684 failed linting in CI, although format.sh passed locally

Changes

This PR introduces npm checks (when installed) and shellcheck into format.sh to more easily identify these issues before a PR is opened

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

.github/workflows/lint.yml                                              @DataDog/system-tests-core
.shellcheck                                                             @DataDog/system-tests-core
format.sh                                                               @DataDog/system-tests-core
requirements.txt                                                        @DataDog/system-tests-core
utils/build/docker/nodejs/express/package-lock.json                     @DataDog/dd-trace-js @DataDog/system-tests-core
utils/scripts/shellcheck.sh                                             @DataDog/system-tests-core

[bm1549]

This came from running npm install; npm ci would fail otherwise

[bm1549]

Needed glob matching to ignore *node_modules*, otherwise this fails locally if you've installed any of them before

[bm1549]

Test failure are unrelated - going to bypass merge