refactor: `checkDirectoryBruteforce` implementation

[dwisiswant0]

IMPORTANT: Please do not create a PR without creating an issue first!

(Any change needs to be discussed before proceeding. Failure to do so may result in the rejection of the pull request).

Summary

In this commit, the checkDirectoryBruteforce function has been refactored for improved efficiency and clarity. The previous logic involving file extension extraction and replacement has been streamlined. The regex pattern is created using the modified path directly. The regexp.MatchString call has been adjusted to directly match the pattern against the directory bruteforce data stored in the threat data structure. This modification improves functionality, ensures maintainability, and accommodates dataset alterations as indicated in the following source:

• https://groups.google.com/g/teler-announce/c/yZMkq5OPcgU

Proposed of changes

This PR fixes/implements the following bugs/features:

• Bug 1
• Bug 2
• Feature 1
• Feature 2
• Breaking changes

How has this been tested?

Proof:

Closing issues

Fixes #

Checklist:

• [x] My code follows the code style of this project.
• [x] My changes successfully ran and pass linters locally (run make lint).
• [x] I have written new tests for my changes.
  • [x] My changes successfully ran and pass tests locally.
• [x] My change requires a change to the documentation.
  • [x] I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.16% :tada:

Comparison is base (8b45daf) 80.83% compared to head (3887b49) 81.00%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #78 +/- ## ========================================== + Coverage 80.83% 81.00% +0.16% ========================================== Files 5 5 Lines 1002 995 -7 ========================================== - Hits 810 806 -4 + Misses 144 142 -2 + Partials 48 47 -1 ``` | [Files Changed](https://app.codecov.io/gh/kitabisa/teler-waf/pull/78?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kitabisa) | Coverage Δ | | |---|---|---| | [analyze.go](https://app.codecov.io/gh/kitabisa/teler-waf/pull/78?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kitabisa#diff-YW5hbHl6ZS5nbw==) | `77.20% <100.00%> (+0.41%)` | :arrow_up: |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.