fix: Center each import icon and add a tooltip II

[lyndsiWilliams]

SUMMARY

I have added a tooltip with text "Import [object]" (example: "Import Database", "Import Dataset", etc.) on all occurrences of the import icon: Database, Dataset, Chart, Dashboard, Saved Query. I have also centered each tooltip icon.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TEST PLAN

• Navigate to all pages with an import icon (Database, Dataset, Chart, Dashboard, Saved Query)
• Observe that the icon is centered with it's neighboring button(s)
• Hover mouse pointer over the import icon
• Observe the appropriate relative "Import [object]" tooltip

ADDITIONAL INFORMATION

• Has associated issue: [Design]Import chart/dashboard UI icon is misleading #13920
• 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 #14192 (1fecae3) into master (df04c3a) will decrease coverage by 3.09%.
The diff coverage is 93.10%.

❗ Current head 1fecae3 differs from pull request most recent head 7cb39ab. Consider uploading reports for the commit 7cb39ab to get more accurate results

@@            Coverage Diff             @@
##           master   #14192      +/-   ##
==========================================
- Coverage   79.24%   76.15%   -3.10%     
==========================================
  Files         945      945              
  Lines       47950    47928      -22     
  Branches     6069     5950     -119     
==========================================
- Hits        37998    36498    -1500     
- Misses       9817    11224    +1407     
- Partials      135      206      +71     

Flag	Coverage Δ
cypress	?
javascript	70.27% <87.09%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...erset-frontend/src/SqlLab/components/SqlEditor.jsx	54.62% <ø> (-1.39%)	⬇️
...rontend/src/SqlLab/components/SqlEditorLeftBar.jsx	53.22% <ø> (-3.23%)	⬇️
...et-frontend/src/SqlLab/components/TableElement.jsx	89.02% <ø> (ø)
...uperset-frontend/src/components/Collapse/index.tsx	100.00% <ø> (ø)
...rset-frontend/src/components/ErrorMessage/types.ts	100.00% <ø> (ø)
superset-frontend/src/components/Menu/SubMenu.tsx	100.00% <ø> (ø)
superset-frontend/src/components/Modal/Modal.tsx	100.00% <ø> (ø)
superset-frontend/src/components/Modal/index.ts	100.00% <ø> (ø)
...set-frontend/src/components/ModalTrigger/index.jsx	95.65% <ø> (-4.35%)	⬇️
superset-frontend/src/dashboard/actions/hydrate.js	3.36% <0.00%> (-71.00%)	⬇️
... and 234 more

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[hughhhh]

/testenv up

[github-actions]

@hughhhh Ephemeral environment spinning up at http://35.161.27.87:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[hughhhh]

/testenv up FEATURE_VERSIONED_EXPORT=true

[github-actions]

@hughhhh Ephemeral environment spinning up at http://54.200.53.244:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[Steejay]

@lyndsiWilliams thanks for this work here! Here are the capitalization guidelines for copy:
https://github.com/apache/superset/wiki/Capitalization-Guidelines

Objects are not considered proper nouns so the tooltip should read: "Import saved query" not "Import Saved Query". Additionally, let's change the copy to read "Import queries" instead.

Copy to use:

• Import queries
• Import dashboards
• Import datasets
• Import charts

cc @yousoph

[hughhhh]

/testenv up FEATURE_VERSIONED_EXPORT=true

[github-actions]

@hughhhh Ephemeral environment spinning up at http://54.149.249.58:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.