fix(sqllab): Add docText for long keyword

[justinpark]

SUMMARY

Since the keyword tooltip is fixed size, a longer keyword name will be collapsed. This commit add docText for long keywords to enable the tooltip for the longer item.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:

after--doc-text-for-long-text.mov

Before:

TESTING INSTRUCTIONS

Go to SQL Lab and enable autocomplete
Please select a schema including a long table name

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

[codecov]

Codecov Report

Merging #24847 (1bf2e26) into master (e2d5046) will increase coverage by 0.01%.
Report is 9 commits behind head on master.
The diff coverage is 96.00%.

❗ Current head 1bf2e26 differs from pull request most recent head fa79fd3. Consider uploading reports for the commit fa79fd3 to get more accurate results

@@            Coverage Diff             @@
##           master   #24847      +/-   ##
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+ Coverage   68.99%   69.00%   +0.01%     
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  Files        1903     1904       +1     
  Lines       74072    74109      +37     
  Branches     8193     8195       +2     
==========================================
+ Hits        51107    51142      +35     
- Misses      20844    20848       +4     
+ Partials     2121     2119       -2     

Flag	Coverage Δ
javascript	55.84% <87.50%> (+<0.01%)	⬆️

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

Files Changed	Coverage Δ
...ins/legacy-preset-chart-nvd3/src/transformProps.js	7.14% <0.00%> (-0.27%)	⬇️
...t-frontend/src/components/AsyncAceEditor/index.tsx	91.66% <ø> (ø)
superset/advanced_data_type/api.py	100.00% <ø> (ø)
superset/annotation_layers/annotations/api.py	89.23% <ø> (ø)
superset/annotation_layers/annotations/schemas.py	100.00% <ø> (ø)
superset/annotation_layers/api.py	86.20% <ø> (ø)
superset/annotation_layers/schemas.py	100.00% <ø> (ø)
superset/async_events/api.py	100.00% <ø> (ø)
superset/available_domains/api.py	100.00% <ø> (ø)
superset/cachekeys/api.py	96.15% <ø> (ø)
... and 60 more

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[michael-s-molina]

Thank you for the PR @justinpark. I left some first-pass comments.

[michael-s-molina]

LGTM