feat: Enable taxonomy/tagging feature in MFE by default

[bradenmacdonald]

Description

This PR sets the tagging feature as enabled by default. The ENABLE_TAGGING_TAXONOMY_PAGES environment variable (along with the content_tagging.disabled waffle flag) can still be used to turn it off when necessary.

Supporting information

Relates to openedx/edx-platform#34633

Replaces #971 as I'm worried about the performance implications of that one; this one is a dead simple env var, rather than loading waffle flag data from the LMS.

Testing instructions

Override the ENABLE_TAGGING_TAXONOMY_PAGES variable to false, and make sure no tagging functionality appears in the MFE.

Other information

Before merging: make sure 2U sets the env var to false on edx.org because they aren't ready to launch this feature yet.

But otherwise, we want it on by default for developers and all users of the Redwood release.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (087c82c) to head (c1b83be).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #989   +/-   ##
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  Coverage   92.21%   92.21%           
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  Files         703      703           
  Lines       12361    12363    +2     
  Branches     2682     2680    -2     
=======================================
+ Hits        11399    11401    +2     
  Misses        926      926           
  Partials       36       36           

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[ChrisChV]

@bradenmacdonald Looks good 👍

• I tested this: I testest the default value, and I testes disabling the value.
• I read through the code and considered the security, stability and performance implications of the changes.
• Includes tests for bugfixes and/or features added.
• Includes documentation

[jesperhodge]

Looks good. Always makes me very happy when something is well-tested like here.

[bradenmacdonald]

Thanks @jesperhodge! Would you mind merging this once you're confirmed it's overridden to false (disabled) on edx.org ?

[arbrandes]

Looks great! Thanks!

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