refactor: icon to icons for lastupdated component

[pkdotson]

SUMMARY

This pr updates the lastupdated component

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

after

TESTING INSTRUCTIONS

go to alerts and reports to view the lastupdated component

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #15401 (2536d09) into master (22d23fc) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #15401      +/-   ##
==========================================
- Coverage   77.23%   77.20%   -0.03%     
==========================================
  Files         975      975              
  Lines       50592    50638      +46     
  Branches     6204     6228      +24     
==========================================
+ Hits        39075    39096      +21     
- Misses      11310    11331      +21     
- Partials      207      211       +4     

Flag	Coverage Δ
javascript	71.70% <100.00%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
...rset-frontend/src/components/LastUpdated/index.tsx	96.00% <100.00%> (ø)
...d/src/explore/components/DatasourcePanel/index.tsx	81.33% <0.00%> (-9.74%)	⬇️
...rBar/CascadeFilters/CascadeFilterControl/index.tsx	90.00% <0.00%> (-2.31%)	⬇️
...tersConfigModal/FiltersConfigForm/ColumnSelect.tsx	95.91% <0.00%> (-1.46%)	⬇️
...ters/FiltersConfigModal/FiltersConfigForm/utils.ts	92.30% <0.00%> (-1.45%)	⬇️
...onfigModal/FiltersConfigForm/FiltersConfigForm.tsx	69.52% <0.00%> (-0.65%)	⬇️
superset-frontend/src/components/Select/Select.tsx	0.00% <0.00%> (ø)
...ers/components/TimeGrain/TimeGrainFilterPlugin.tsx	0.00% <0.00%> (ø)
...Filters/FilterBar/FilterControls/FilterControl.tsx	100.00% <0.00%> (ø)
.../FilterBar/CascadeFilters/CascadePopover/index.tsx	62.31% <0.00%> (+0.55%)	⬆️

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