chore(sqllab): Remove max-width on side panel

[justinpark]

SUMMARY

When a long table option is selected, the selection chip can be overlaps the main editor's panel.
Sometime it can cover the "Run" cta button so hard to run the query.

This commit removes the max-width on sidebar so it can be extended for the overflowing case.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

• Before:

sqllab-sidebar--before.mov

• After:

sqllab-sidebar--after.mov

TESTING INSTRUCTIONS

• Go to sqllab
• Choose a long table name option

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[ktmud]

Idk, would the users hate it more if too much space for SQL editor was taken over?

Can we maybe render the selected items with ellipses in the middle of text and add a tooltip for full table names?

[ktmud]

Something like this

[codecov]

Codecov Report

Merging #21280 (fb4d5ee) into master (034ee1c) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #21280      +/-   ##
==========================================
- Coverage   66.43%   66.43%   -0.01%     
==========================================
  Files        1784     1784              
  Lines       68185    68189       +4     
  Branches     7265     7265              
==========================================
+ Hits        45298    45300       +2     
- Misses      21018    21020       +2     
  Partials     1869     1869              

Flag	Coverage Δ
javascript	52.49% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset-frontend/src/SqlLab/actions/sqlLab.js	61.05% <0.00%> (-0.33%)	⬇️
...d/src/SqlLab/components/SaveDatasetModal/index.tsx	52.87% <0.00%> (ø)
...-frontend/src/components/FilterableTable/index.tsx	72.63% <0.00%> (+0.29%)	⬆️

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[EugeneTorap]

@nytai Why did you merge the PR? We can do it more elegantly.
@ktmud suggested a good idea to clip the text of the selected item and display the full text when hovering over it.
This is a good approach because the width of sidebar doesn't change depending on the long text of the item, the sidebar and sqlEditor always have the same width.