feat: add Qualtrics Survey XBlock

[irtazaakram]

This PR moved Qualtrics Survey XBlock from https://github.com/openedx/xblock-qualtrics-survey

Test Instructions

• Installed xblocks-extra in the platform

• Enabled the XBlock by adding:

  qualtricssurvey
  

  to Advanced Module List in Studio

• Open Studio → navigate to any unit

• Add Qualtrics Survey from Advanced Components

• Configure the block with:

  • Display Name
  • Survey ID
  • University
  • Link Text
  • Message
  • (optional) Param Name for User ID

• Save and Preview / View Live

Verification

• Confirm the component renders correctly in LMS
• Clicking the link redirects to the configured Qualtrics survey
• Verified using a test survey created on Qualtrics (personal test account)

• Resolves XBlock Qualtrics Survey Migration #9
• Related to Consolidate Optional XBlocks public-engineering#317

The original repository is being deprecated here: openedx/xblock-qualtrics-survey#252

Testing SS:

[codecov]

Codecov Report

❌ Patch coverage is 89.41176% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.01%. Comparing base (3c4c8d1) to head (daa763a).

Files with missing lines	Patch %	Lines
src/qualtricssurvey/views.py	85.00%	3 Missing ⚠️
src/qualtricssurvey/mixins/fragment.py	94.11%	1 Missing and 1 partial ⚠️
src/qualtricssurvey/mixins/scenario.py	77.77%	2 Missing ⚠️
src/qualtricssurvey/models.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   83.33%   89.01%   +5.67%     
==========================================
  Files           1        6       +5     
  Lines           6       91      +85     
  Branches        1        4       +3     
==========================================
+ Hits            5       81      +76     
- Misses          0        8       +8     
- Partials        1        2       +1     

Flag	Coverage Δ
unittests	89.01% <89.41%> (+5.67%)	⬆️

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[farhan]

LGTM!