Only create language packs if project is active

[grappler]

Description Fixes #138

How has this been tested?

• Ran docker-compose run cli wp --allow-root --url=translate.required.com.docker.amazee.io traduttore project build prohelvetia/ph-offices-abroad on a project that I marked as inactive.
• Updated translations and checked that no cron job is scheduled. docker-compose run cli wp --allow-root --url=translate.required.com.docker.amazee.io cron event list

Checklist:

• [x] My code is tested.
• [x] My code follows the WordPress code style.
• [x] My code has proper inline documentation.

[swissspidy]

That GitHub suggestion feature messed up the indentation it seems 🤦‍♂️

[codecov-io]

Codecov Report

Merging #144 into master will increase coverage by 0.11%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #144      +/-   ##
============================================
+ Coverage     79.68%   79.79%   +0.11%     
- Complexity      372      379       +7     
============================================
  Files            24       24              
  Lines           891      896       +5     
============================================
+ Hits            710      715       +5     
  Misses          181      181

Impacted Files	Coverage Δ	Complexity Δ
inc/Project.php	100% <100%> (ø)	53 <1> (+1)	:arrow_up:
inc/Plugin.php	37.67% <100%> (+1.3%)	54 <0> (+6)	:arrow_up:

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