Use POST method when requesting the API login endpoint

[mcarmona99]

This PR closes #3906.

In this pull request, I have changed the method used when requesting the API login endpoint from GET to POST because as it was said in the related issue, the actual login endpoint (GET) is going to be deprecated.

New generate-api-4.0-info.js output (it works with the new changes):

# node generate-api-4.0-info.js https://localhost:55000
--------------- Configuration ---------------
Wazuh API url: https://localhost:55000
Output directory: /output
Output endpoints mode: Simple
----------------------------------------------
[SUCCESS] File was created! Path: /output/endpoints.json
[SUCCESS] File was created! Path: /output/security-actions.json

[Desvelao]

review
code ✔️
test ✔️

[yenienserrano]

CR: ✔️
Test: ✔️

[github-actions]

The backport to 4.4-1.2-wzd failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-4.4-1.2-wzd 4.4-1.2-wzd
# Navigate to the new working tree
cd .worktrees/backport-4.4-1.2-wzd
# Create a new branch
git switch --create backport-4103-to-4.4-1.2-wzd
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 3977e45c6ffdc06926edfd12355f0f20dd2f9d84
# Push it to GitHub
git push --set-upstream origin backport-4103-to-4.4-1.2-wzd
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-4.4-1.2-wzd

Then, create a pull request where the base branch is 4.4-1.2-wzd and the compare/head branch is backport-4103-to-4.4-1.2-wzd.