Fix pre-popullation of default dates when using "dateformat" + {"format": "date"}

[fiskus]

Pre-filling dates was happened during final validation on package submit but not during validation on form change. Fixed this

Also, re-used function for getting default value with "workaround" for "dateformat" field

[codecov]

Codecov Report

Merging #3082 (1948b8e) into master (2db5e08) will increase coverage by 53.31%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #3082       +/-   ##
===========================================
+ Coverage   35.47%   88.78%   +53.31%     
===========================================
  Files         641       79      -562     
  Lines       28327     9616    -18711     
  Branches     4132        0     -4132     
===========================================
- Hits        10049     8538     -1511     
+ Misses      17096     1078    -16018     
+ Partials     1182        0     -1182     

Flag	Coverage Δ
api-python	90.72% <ø> (ø)
catalog	?
lambda	86.07% <ø> (ø)

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Impacted Files	Coverage Δ
catalog/app/components/JsonEditor/State.js
.../containers/Bucket/PackageDialog/PackageDialog.tsx
...ntainers/Admin/Buckets/gql/BucketsAdd.generated.ts
...app/containers/Admin/RolesAndPolicies/Policies.tsx
catalog/app/components/Preview/loaders/Json.js
...og/app/containers/Bucket/Queries/requests/index.ts
catalog/app/embed/File.js
catalog/app/embed/Dir.js
catalog/app/containers/Admin/Status/DataGrid.ts
catalog/app/utils/voila.ts
... and 552 more

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