revert: rollback changes from #2171 and #2181

[rpenido]

Description

We refactored the way we store content tag data while exporting the XBlock and some previous changes are not needed anymore. This reverts the following PRs:

• [FC-0049] feat: Serialize tag data in OpenAssessmentBlocks #2171
• feat: deserialize tag info from xml [FC-0049] #2181

More information

• Related to [Tagging] Pasting XBlocks containing Tag data in clipboard modular-learning#180
• Discussion here: feat: paste tags when pasting xblocks with tag data [FC-0049] edx-platform#34270 (comment)

Depends on:

• feat: add get_taxonomy_by_export_id method [FC-0049] openedx-learning#164
• feat: deserialize tag info from xml [FC-0049] #2181

Testing instructions

• Make sure the tests cover the various cases.

---

Private ref: FAL-3621

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (2e8ed09) to head (8dffff1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2184      +/-   ##
==========================================
- Coverage   95.04%   95.03%   -0.01%     
==========================================
  Files         191      191              
  Lines       21035    21003      -32     
  Branches     1899     1896       -3     
==========================================
- Hits        19992    19960      -32     
  Misses        779      779              
  Partials      264      264              

Flag	Coverage Δ
unittests	95.03% <100.00%> (-0.01%)	⬇️

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[rpenido]

I think we should wait for the discussion here before merging this.

[pomegranited]

👍 Thank you for reverting this change @rpenido !

Could you please resolve the conflicts and bump the version again?

• I tested this while testing feat: paste tags when pasting xblocks with tag data [FC-0049] edx-platform#34270
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation N/A
• User-facing strings are extracted for translation N/A

[rpenido]

This is ready for review/merge @pomegranited!

[pomegranited]

I re-tested openedx/edx-platform#34270 with this revert, and it's all working fine.

[openedx-webhooks]

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