fix(sqllab): Save Dataset Modal Multiple overwrites

[Antonio-RiveroMartnez]

SUMMARY

• Stop clearing the selected dataset after overwriting so users can overwrite as many times as they see fit
• There's a new AsyncSelect we should use now

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TESTING INSTRUCTIONS

1. Go to "SQL Editor"
2. Edit SQL query
   e.g.

SELECT "YEAR",
       "MONTH",
       "DAY"
FROM public.flights
LIMIT 10

3. Run the query and then click the "Create Chart" button
4. Select the "Save as new" option and enter the name
5. Click the "Save & Explore" button
6. Repeat steps 1-3
7. Select the "Overwrite existing" and select recently created dataset
8. Click the "Save & Explore" and click the "Overwrite & Explore" button

Expected results:

1. A new tab must open with the chart
2. If you go back to the tab that has the dropdown open you can repeat as many times as you want step 8 from above

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 #20691 (52f099b) into master (ff5b4bc) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master   #20691   +/-   ##
=======================================
  Coverage   66.85%   66.85%           
=======================================
  Files        1753     1753           
  Lines       65839    65838    -1     
  Branches     7007     7007           
=======================================
  Hits        44017    44017           
+ Misses      20036    20035    -1     
  Partials     1786     1786           

Flag	Coverage Δ
javascript	51.95% <0.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...d/src/SqlLab/components/SaveDatasetModal/index.tsx	35.06% <0.00%> (+0.44%)	⬆️

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