[WIP] refactor: Converting TableElement.jsx to functional component

[lyndsiWilliams]

SUMMARY

TableElement.jsx at src/SqlLab/components/TableElement.jsx converted from class to functional component.

TEST PLAN

Current tests are not passing, they make checks through component state which exists in class components but not in functional components. Below is a screenshot of the TableElement rendering correctly after converting from class to functional component.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[lyndsiWilliams]

Working on PR summary and testing.

[codecov-io]

Codecov Report

Merging #12949 (4067237) into master (c781ab8) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12949      +/-   ##
==========================================
- Coverage   66.92%   66.87%   -0.06%     
==========================================
  Files        1024      489     -535     
  Lines       50185    28661   -21524     
  Branches     5213        0    -5213     
==========================================
- Hits        33588    19166   -14422     
+ Misses      16457     9495    -6962     
+ Partials      140        0     -140     

Flag	Coverage Δ
cypress	?
javascript	?
python	66.87% <ø> (+2.78%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/views/database/views.py	62.69% <0.00%> (-24.88%)	⬇️
superset/databases/commands/create.py	83.67% <0.00%> (-8.17%)	⬇️
superset/databases/commands/update.py	85.71% <0.00%> (-8.17%)	⬇️
superset/db_engine_specs/elasticsearch.py	86.95% <0.00%> (-7.49%)	⬇️
superset/db_engine_specs/clickhouse.py	87.09% <0.00%> (-7.35%)	⬇️
superset/sql_validators/base.py	93.33% <0.00%> (-6.67%)	⬇️
superset/db_engine_specs/presto.py	82.25% <0.00%> (-6.28%)	⬇️
superset/db_engine_specs/sqlite.py	90.62% <0.00%> (-6.25%)	⬇️
superset/db_engine_specs/base.py	79.85% <0.00%> (-6.12%)	⬇️
... and 566 more

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[eschutho]

Do you want to set this as a "draft", too?

[lyndsiWilliams]

Corbin has taken this over at this PR.