Add data-testid, aria-label to general buttons, dialogs

[imnasnainaec]

In preparation for using @testing-library/react more broadly (see #3180).

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.64%. Comparing base (bfc9230) to head (b440dd6).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/components/Dialogs/DeleteEditTextDialog.tsx	0.00%	1 Missing ⚠️
src/components/Dialogs/EditTextDialog.tsx	0.00%	1 Missing ⚠️
src/components/Dialogs/SubmitTextDialog.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3299      +/-   ##
==========================================
- Coverage   74.67%   74.64%   -0.04%     
==========================================
  Files         280      280              
  Lines       10734    10734              
  Branches     1296     1296              
==========================================
- Hits         8016     8012       -4     
- Misses       2353     2356       +3     
- Partials      365      366       +1     

Flag	Coverage Δ
backend	83.81% <ø> (-0.09%)	⬇️
frontend	66.64% <0.00%> (ø)

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[jasonleenaylor]

Reviewed 7 of 18 files at r1, 14 of 14 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)