Fill sourceInfo mainUrl for all entities

[elic-eon]

🤔 Why?

To show the web extension tab for entities

🤓 What?

• Fill in sourceInfo.mainUrl as much as possible

🧪 Tested?

Unit tests

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
13438	11998	89%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/looker/lookml_parser.py	94%	🟢
metaphor/power_bi/extractor.py	89%	🟢
metaphor/tableau/extractor.py	87%	🟢
metaphor/thought_spot/extractor.py	92%	🟢
TOTAL	90%	🟢

updated for commit: 0e9cec0 by action🐍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.28%. Comparing base (1f045f2) to head (0e9cec0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1034   +/-   ##
=======================================
  Coverage   89.28%   89.28%           
=======================================
  Files         206      206           
  Lines       13435    13438    +3     
=======================================
+ Hits        11995    11998    +3     
  Misses       1440     1440           

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