[ACA-3731] E2E test to validate Save, Save as and Delete buttons availability on custom filters

[bogdanapatrichi]

• Add createNewCustomFilter() method in edit-task-filters-component.e2e.ts

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: E2E test for Delete, Save and Save as actions that should be displayed and enabled when clicking on custom filter header

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

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:

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[codecov-commenter]

Codecov Report

Merging #5929 into develop will increase coverage by 2.15%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5929      +/-   ##
===========================================
+ Coverage    76.06%   78.22%   +2.15%     
===========================================
  Files          843      142     -701     
  Lines        18726     3885   -14841     
  Branches      3684      773    -2911     
===========================================
- Hits         14244     3039   -11205     
+ Misses        3361      598    -2763     
+ Partials      1121      248     -873     

Impacted Files	Coverage Δ
.../lib/upload/directives/file-draggable.directive.ts	32.65% <0.00%> (-1.39%)	⬇️
...src/lib/task/start-task/start-task-cloud.module.ts
...vices/src/lib/task-list/models/start-task.model.ts
.../core/card-view/models/card-view-boolitem.model.ts
...hael/icons/raphael-icon-business-rule.component.ts
...ram/components/swimlanes/diagram-pool.component.ts
lib/core/form/services/form.service.ts
...onents/icons/diagram-icon-script-task.component.ts
...lib/task/task-filters/models/filter-cloud.model.ts
lib/core/mock/bpm-user.service.mock.ts
... and 692 more

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