fix(util:ArrayService): fix cancel return readonly of flat, uniq

[cipchk]

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• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #1171 (d37133e) into master (88c2a1c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1171   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files         265      265           
  Lines        7990     7990           
  Branches     1599     1599           
=======================================
  Hits         7696     7696           
  Misses        131      131           
  Partials      163      163           

Impacted Files	Coverage Δ
packages/util/array/array.service.ts	100.00% <100.00%> (ø)

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