fix: add blackout dates validation for non supported browsers

[awais-ansari]

1. Data and Time field works for the latest version of browsers and restricts the user to enter invalid dates and times.
2. I added date and time validation for non supported browsers.
3. User is allowed to enter dates in 2 formats ['YYYY-MM-DD', 'MM/DD/YYYY'] in non-supported browsers which will make validation smooth on both platforms.
4. User is allowed to enter time in 2 formats ['HH:mm', 'hh:mm A'] (24 hours, 12 hours) in non-supported browsers which will make validation smooth on both platforms.

[awaisdar001]

Added some questions & nits.

[codecov-commenter]

Codecov Report

Merging #203 (baaab84) into master (9fd6cbf) will decrease coverage by 0.53%.
The diff coverage is 29.72%.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   66.54%   66.00%   -0.54%     
==========================================
  Files          93       93              
  Lines        1647     1674      +27     
  Branches      355      364       +9     
==========================================
+ Hits         1096     1105       +9     
- Misses        532      544      +12     
- Partials       19       25       +6     

Impacted Files	Coverage Δ
...s/app-config-form/apps/legacy/LegacyConfigForm.jsx	72.72% <0.00%> (-3.47%)	⬇️
...iscussions/app-config-form/apps/shared/messages.js	100.00% <ø> (ø)
src/pages-and-resources/discussions/data/api.js	91.89% <0.00%> (+2.41%)	⬆️
src/utils.js	30.76% <14.28%> (-7.53%)	⬇️
...and-resources/discussions/app-config-form/utils.js	36.53% <57.14%> (+7.96%)	⬆️

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[awaisdar001]

left some questions here.