Revert "Change TS compilation target to es2019 (#144)"

[pan-kot]

This reverts commit a068119 as causing issues in the internal pipeline.

Description

[Include a summary of the changes and the related issue.]

[Also include relevant motivation and context.]

How has this been tested?

[How did you test to verify your changes?]

[How can reviewers test these changes efficiently?]

[Check for unexpected visual regressions, see CONTRIBUTING.md for details.]

Documentation changes

[Do the changes include any API documentation changes?]

• Yes, this change contains documentation changes.
• No.

Related Links

[Attach any related links/pull request for this change]

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #169 (4733786) into main (c4f788e) will increase coverage by 1.82%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
+ Coverage   90.59%   92.42%   +1.82%     
==========================================
  Files         537      537              
  Lines       13269    15520    +2251     
  Branches     4254     4259       +5     
==========================================
+ Hits        12021    14344    +2323     
+ Misses       1166     1094      -72     
  Partials       82       82              

Impacted Files	Coverage Δ
src/tag-editor/index.tsx	90.72% <0.00%> (+0.61%)	⬆️
src/tag-editor/utils.ts	65.00% <0.00%> (-21.67%)	⬇️
src/mixed-line-bar-chart/utils.ts	92.15% <100.00%> (+0.49%)	⬆️
src/top-navigation/parts/overflow-menu/header.tsx	7.14% <0.00%> (-5.36%)	⬇️
...p-navigation/parts/overflow-menu/views/submenu.tsx	5.88% <0.00%> (-4.12%)	⬇️
src/select/parts/virtual-list.tsx	8.33% <0.00%> (-3.21%)	⬇️
src/top-navigation/parts/overflow-menu/index.tsx	5.55% <0.00%> (-1.59%)	⬇️
...navigation/parts/overflow-menu/views/utilities.tsx	11.11% <0.00%> (-1.39%)	⬇️
...c/top-navigation/parts/overflow-menu/menu-item.tsx	7.69% <0.00%> (-0.75%)	⬇️
src/s3-resource-selector/s3-modal/table-utils.ts	88.88% <0.00%> (-0.59%)	⬇️
... and 322 more

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