[ACA-3977] FE - Integrate new user assign API

[sivakumar414ram]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

https://issues.alfresco.com/jira/browse/ACA-3977

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-commenter]

Codecov Report

Merging #6157 into develop will increase coverage by 2.10%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #6157      +/-   ##
===========================================
+ Coverage    76.29%   78.40%   +2.10%     
===========================================
  Files          852      339     -513     
  Lines        19067     9285    -9782     
  Branches      3779     1881    -1898     
===========================================
- Hits         14548     7280    -7268     
+ Misses        3378     1424    -1954     
+ Partials      1141      581     -560     

Impacted Files	Coverage Δ
...-cloud/src/lib/task/services/task-cloud.service.ts	79.48% <100.00%> (+2.02%)	⬆️
...src/lib/document-list/data/share-data-row.model.ts	73.68% <0.00%> (-2.64%)	⬇️
...n/date-range-filter/date-range-filter.component.ts	92.59% <0.00%> (-1.86%)	⬇️
...mon/date-range-filter/date-range-filter.service.ts	86.36% <0.00%> (-0.60%)	⬇️
.../lib/task-list/components/attach-form.component.ts	43.58% <0.00%> (ø)
lib/core/mock/form/form.component.mock.ts
lib/core/mock/comment-content-service.mock.ts
...dgets/dynamic-table/number-cell-validator.model.ts
lib/core/search-text/search-text-input.module.ts
lib/core/services/user-preferences.service.ts
... and 515 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b67b3b8...775d0ad. Read the comment docs.

[mauriziovitale]

check the comments