Fix incomplete wp core files

[dingo-d]

Description

Fix failures that happened on WP 6+ due to the fact that the wordpress-develop repo doesn't have all the WordPress core files inside its source folder.

Also added a new --force parameter to force a download of the new WordPress development and core

Types of changes

Improvement and bugfixes

Checklist:

• [x] My code is tested.
• [x] My code follows the code style set by the project.
• [x] I've included documentation for the changes.

[codecov-commenter]

Codecov Report

Merging #21 (ac5033e) into develop (0dae29a) will decrease coverage by 4.45%. The diff coverage is 86.15%.

@@              Coverage Diff              @@
##             develop      #21      +/-   ##
=============================================
- Coverage      90.07%   85.62%   -4.46%     
- Complexity        38       45       +7     
=============================================
  Files              1        1              
  Lines            131      160      +29     
=============================================
+ Hits             118      137      +19     
- Misses            13       23      +10     

Flag	Coverage Δ
unittests	85.62% <86.15%> (-4.46%)	:arrow_down:

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Impacted Files	Coverage Δ
src/Command/InitCommand.php	85.62% <86.15%> (-4.46%)	:arrow_down:

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