[ADF-5261] Fix excluded flaky tests C297689, C297690

[dhrn]

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/ADF-5261

What is the new behaviour?

fixed

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 #6212 into develop will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6212      +/-   ##
===========================================
+ Coverage    76.24%   76.28%   +0.04%     
===========================================
  Files          862      862              
  Lines        19415    19415              
  Branches      3855     3855              
===========================================
+ Hits         14802    14811       +9     
+ Misses        3461     3451      -10     
- Partials      1152     1153       +1     

Impacted Files	Coverage Δ
lib/core/services/upload.service.ts	88.82% <0.00%> (+3.35%)	⬆️
.../lib/task-list/components/attach-form.component.ts	51.28% <0.00%> (+7.69%)	⬆️

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