test(prohibited-file-names): verify push rule regular expressions

Feature Request

1. User story

As a security engineer and citizen,
I must prevent people from push secrets to public repositories
In order to protect confidential information.

2. Acceptance criteria

We'll be done when:

• 1. The regular expressions and string matches in signatures.json prevent engineers for pushing confidential information to GitLab source code repositories.
• 2. Each regular expression can be set to block, warn, or ignore matches.

3. Functional test plan

Problem: How can we automatically assess every single signature?

1. Install the data-loss-signatures and gl-got module.

   npm i data-loss-signatures gl-got

2. Create a personal access token with api access.

3. Create a Jest spec to test each signature.

4. Convert signatures.json into an array of Signature.prototypes:

   const dls = require('data-loss-signatures')
   const glGot = require('gl-got')
   const signaturesJson = require('data-loss-signatures/signatures.json')
   
   describe('GitLab Push Rules Prohibited File Names', () => {
     describe('are regular expressions and strings that each', () => {
       it('matches a data-leakage pattern', () => {
         const signatures = dls.signature.toArray(signaturesJson)
         signatures.forEach((signature) => {
           // Remove all prohibited file names and POST each one
           // Try to push this repo to your branch.
           // Output each result.
         })
       })
     })
   })