chore: change button name in Sql Lab

[AAfghahi]

SUMMARY

Changes the name of Explore to Create Chart to be more explicit.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

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 #20163 (9ec30d7) into master (d5c5e58) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20163   +/-   ##
=======================================
  Coverage   66.45%   66.45%           
=======================================
  Files        1721     1721           
  Lines       64497    64509   +12     
  Branches     6805     6811    +6     
=======================================
+ Hits        42860    42870   +10     
- Misses      19905    19906    +1     
- Partials     1732     1733    +1     

Flag	Coverage Δ
javascript	51.34% <ø> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...c/SqlLab/components/ExploreResultsButton/index.tsx	100.00% <ø> (ø)
...end/src/dashboard/components/SliceHeader/index.tsx	86.27% <0.00%> (-0.96%)	⬇️
superset-frontend/src/explore/fixtures.tsx	66.66% <0.00%> (ø)
...perset-frontend/src/utils/getControlsForVizType.js	92.85% <0.00%> (ø)
...set-frontend/src/explore/actions/exploreActions.ts	50.00% <0.00%> (ø)
...et-frontend/src/components/EditableTitle/index.tsx	70.00% <0.00%> (ø)
...et-frontend/src/explore/reducers/exploreReducer.js	28.75% <0.00%> (ø)
...ntend/src/explore/controlUtils/getControlConfig.ts	100.00% <0.00%> (ø)
...nd/src/explore/components/DataTablesPane/index.tsx	71.55% <0.00%> (ø)
...plugins/legacy-plugin-chart-heatmap/src/Heatmap.js	0.00% <0.00%> (ø)
... and 4 more

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