fix: `process.env` treated as unsafe in `ignores`

[SpenserJ]

Steps to Reproduce

1. Globally install `@commitlint/cli@v19.7.1` (or local install and changing step 3)
2. Configure commitlint to conditionally allow a message based on an environment variable
  * Example: Disallow `wip` prefixed messages when running in CI with `commit => !process.env.CI && /^wip\b/.test(commit)`
3. Run `echo "wip: test" | commitlint`
4. Run `echo "wip: test" | CI=1 commitlint`

Current Behavior

Error of Ignore function contains forbidden pattern: process is thrown

file:///.../node_modules/@commitlint/cli/lib/cli.js:132
        throw err;
        ^

Error: Ignore function contains forbidden pattern: process.
    at validateIgnoreFunction (file:///.../node_modules/@commitlint/is-ignored/lib/validate-ignore-func.js:8:15)
    at Array.forEach (<anonymous>)
    at isIgnored (file:///.../node_modules/@commitlint/is-ignored/lib/is-ignored.js:9:13)
    at lint (file:///.../node_modules/@commitlint/lint/lib/lint.js:13:9)
    at file:///.../node_modules/@commitlint/cli/lib/cli.js:238:65
    at Array.map (<anonymous>)
    at main (file:///.../node_modules/@commitlint/cli/lib/cli.js:238:48)

Node.js v18.17.1

Expected Behavior

Commitlint should block dangerous process calls, but should not prevent accessing process.env.*

• echo "wip: test" | commitlint - Should succeed (no CI environment set)
• echo "wip: test" | CI=1 commitlint (CI environment blocks wip commits)

Affected packages

• cli
• core
• prompt
• config-angular

Possible Solution

This was caused by #4258, and likely involves modifying https://github.com/conventional-changelog/commitlint/blob/v19.7.1/%40commitlint/is-ignored/src/validate-ignore-func.ts to either have a tighter scope for what dangerousPattern matches, or a check to allow process.env.

Potential solution using negative lookahead patterns:

/(?:process(?!\.env)|require|import|eval|fetch|XMLHttpRequest|fs|child_process)(?:\s*\.|\s*\()|(?:exec|execFile|spawn)\s*\(/

Context

Our team runs various checks like ESLint, Prettier, and commitlint locally through lint-staged and in CI. We permit making wip: ... commits in a local environment, but we have a CI check that prevents a PR from being merged until the commit is finalized (the message is updated). We use an ignores function that checks for process.env.CI (set by GitHub CI) to fail messages in PRs

commitlint --version

@commitlint/cli@19.7.1

git --version

v2.44.0

node --version

v18.17.1

[escapedcat]

Needs a release