Always remove POT-Creation-Date metadata

[shadinaif]

After multiple discussions, and as part of FC-0012 project project; the team decided to always remove POT-Creation-Date from translation extraction (from extract command). The reason is that this metadata is causing openedx-translations repo to generate too many useless commits that differ only in Creation Date in related files (see example commits here)

This PR will also activate tests for extract script that have been skipped a long time ago because it was part of edx-platform

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[shadinaif]

Please review @OmarIthawi @brian-smith-tcril

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +8.39 :tada:

Comparison is base (723a0fb) 91.07% compared to head (da854b2) 99.47%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #129 +/- ## ========================================== + Coverage 91.07% 99.47% +8.39% ========================================== Files 10 10 Lines 381 381 Branches 29 28 -1 ========================================== + Hits 347 379 +32 + Misses 33 0 -33 - Partials 1 2 +1 ``` | [Impacted Files](https://app.codecov.io/gh/openedx/i18n-tools/pull/129?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx) | Coverage Δ | | |---|---|---| | [tests/test\_extract.py](https://app.codecov.io/gh/openedx/i18n-tools/pull/129?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#diff-dGVzdHMvdGVzdF9leHRyYWN0LnB5) | `98.00% <100.00%> (+64.00%)` | :arrow_up: |

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[shadinaif]

a linter test is failing because run method is too long, I'll fix it after we decide what to do with the code review above

[brian-smith-tcril]

@mphilbrick211 it looks like this repo isn't on the spreadsheet at all, it's also not in backstage. Do you know who I should ping on this?

[mphilbrick211]

@AliAdnanSohail - would you mind reviewing this, and merging if all looks good? Thanks!

cc: @brian-smith-tcril

[openedx-webhooks]

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